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My Mineral Collection, Systematic Phyllosilicates Page

These are my phyllosilicates - they're generally soft but strong minerals and include clays, micas, and asbestos. Often called sheet silicates, their structure consists of loosely connected sheets of 4, 6, or 8-tetrahedron rings (or combinations thereof) - the result leads to large directional differences in transparency, hardness, and flexibility.
Phyllosilicates on Other Pages
See more palygorskite on my andradite garnets page.

See also ajoite on my copper minerals page.

Wickenburgite is on my lead minerals page.

Another Ephesite, willemseite, and more zinnwaldite are on my oxides page.

A little bit of orlymanite is on my inosilicates page.

Phyllosilicate Info
Lepidolite is now a group name for a series of trioctahedral light-colored micas with substantial lithium - the series includes polylithionite and trilithionite. There may be a color-composition relationship here, varying from the traditional lepidolite/trilithionite lavender through colorless to yellow polylithionite. Because they're unanalyzed, my lepidolites will still be called lepidolites even though some of them are yellow. Some of the trioctahedral (and dioctahedral) micas have not been fully investigated. The dioctahedral micas glauconite, illite, phengite and the trioctahedral micas biotite and zinnwaldite also are now group names rather than individual species.
Specimens on This Page
(links take you to either the first or only specimen)

69 Rows

Agrellite

Once an inosilicate, now a phyllosilicate, agrellite is a calcium sodium fluorotetrasilicate. This miniature of massive agrellite comes from the type locality of the Kipawa river, Villedieu Township, Témiscamingue County, Québec, Canada.

Thanks to Marcus Origlieri's The Mineral Zone auction on eBay for the specimen and the image!

Allophane

One of the very few amorphous minerals, allophane (a hydrated aluminum silicate) can occur in many pastel colors - this thumbnail, colored blue by probable chrysocolla) is from the Juanita Mine, Kelly, Socorro County, Magdalena, New Mexico.

Thanks to Paul Williams' auction on eBay for the specimen and the images!

Allophane

A miniature of layered allophane, also tinted blue by copper) is from the famous Kelly Mine, Magdalena, Socorro County, New Mexico.

Thanks to Jan Garland's (Fine Rocks) auction on eBay for the specimen!

Row 2

Allophane, var.
Cuproallophane

This deep blue cuproallophane has a higher copper content than my blue allophane - this miniature is from the classic Copper Queen Mine, Bisbee, Cochise County, Arizona.

Thanks to Thomas Bee's auction on eBay for the specimen and the image!

Amesite

A small thumbnail of (rarely-seen) tan amesite on matrix from the Passa Limani Cove slag locality, Lavrion District, Attikí Prefecture, Greece. This amesite is tinted brown by impurities.

Thanks to Jake Slagle's Maryland Minerals auction on eBay for the specimen and images!

Amesite, var.
Chromian Amesite

Beautiful transparent purple chromian amesite (chromoamesite on MinDat) on chromite miniature from the Saranovskiy Mine, Saranovskaya Village, Permskaya Oblast', Urals, Russia. The closeup shows an on-axis view of the one pinacoidally-terminated crystal present.

Thanks to Chris Korpi at Pangaea Minerals for the specimen!

Row 3

Amesite, var.
Chromian Amesite

Another chromian amesite (chromamesite on the label) from the Saranovskiy (Sarany) Mine - this one has two lime-green titanite twins (larger image, closeup) on it.

Thanks to SoCal Nevada's auction on eBay for the specimen and images!

Anandite

A large micro of black anandite cleavages in matrix from Esquire No. 8 claim, Big Creek, Rush Creek deposit, Fresno County, California. Anandite's an unusual and rare sulfur-bearing (~8%) member of the mica group.

Thanks to Paolo Bracci's auction on eBay for the specimen and the image!

Annite

A nice miniature of black annite crystals in a sodalite matrix from the Poudrette Quarry, Mont Saint-Hilaire, Monteregie, Quebec. This specimen was collected in 1990. Annite forms a complete series with phlogopite where magnesium replaces iron and is the hydroxyl analog of fluorannite.

Thanks to Ron Sloto's auction on eBay for the specimen and the images!

Row 4

Antigorite

Antigorite (a magnesium iron hydroxysilicate), like amesite, is a member of the serpentine subfamily of phyllosilicates - this large miniature cluster of silky green antigorite is from the Jeffrey Quarry, Asbestos, Québec, Canada.

Thanks to Val Collins' auction on eBay for the specimen and the image!

Antigorite

A small cabinet specimen of compacted antigorite is from the Cedar Hill Quarry in Fulton Township, Lancaster County, Pennsylvania.

Thanks to Lee Rogers' auction on eBay for the specimen and the image!

Antigorite,
var. Bowenite

A nice miniature of light-apple-green bowenite (this color variety of antigorite) from the Conklin Quarry in Lincoln, Rhode Island - the oldest working limestone quarry in the U.S. and type locality. Bowenite's the state mineral of Rhode Island and is named after George T. Bowen who first described the mineral in 1822.

Thanks to Eric Greene's (Treasure Mountain Mining) auction on eBay for the specimen and the images!

Row 5

Antigorite,
var. Bowenite

A second miniature of bowenite - I don't know where this is from. A lot of jewelery-grade bowenite now comes from New Zealand.

Thanks to Deniz Tezcan's auction on eBay for the specimen!

Antigorite, var.
Chrome Antigorite

This chromian antigorite (Mg5(Mg,Cr)(Si,Cr)Si3O10(OH)8) miniature is from the famous Wood's Chrome Mine, Texas, Lancaster County, Pennsylvania.

Thanks to Ed Carvalho's auction on eBay for the specimen!

Antigorite, var.
Chrome Antigorite

This chrome antigorite miniature from the Wood's Chrome Mine is much more fibrous.

Thanks to Richard Koontz' auction on eBay for the specimen!

Row 6

Antigorite,
var. Picrolite

Picrolite is the common name given to a green variety of antigorite of the serpentine family. These two cabinet pieces come from the Thetford mines, Thetford, Quebec, Canada.

Thanks to Dennis Brown's auction on eBay for the specimen and the image!

Antigorite, var.
Williamsite, var.
Chrome Williamsite

The rare emerald-green variety of antigorite is called williamsite - it's the state gemstone of Maryland. This is the deeper green chromium-bearing variety - the larger image (right) shows a backlit portion; you can see the chromite grains. I don't know where this miniature came from.

Thanks to Deniz Tezcan's auction on eBay for the specimen!

Apophyllite

This is a beautiful miniature cluster of clear colorless apophyllite with a classic peach-colored (larger image, bottom left) wheat sheaf of stilbite from Jalgaon, India. Colorless apophyllite is the whitest of all minerals - there's absolutely no tint to it! If it were cut into gemstones they'd appear silvery. There's also some tiny green apophyllites (larger image, bottom right) on the stilbite.

Thanks to Great South Gems & Minerals for the specimen!

Row 7

Apophyllite

There's one blade of stilbite jutting out from the crystal (which is resting on white heulandite) and several tiny basalt stalactites coated with calcite, some of which penetrate the apophyllite (larger image, third panel)!. This interesting vanadium-bearing miniature is from Poona, India.

Apophyllite

More Indian apophyllite - this miniature has stilbite and heulandite (upper right) with it.

Apophyllite

Another green apophyllite miniature from India - this green prism has a hoppered termination (larger image, bottom) instead of the typical four-sided diamond-faced pyramid. Even though the vanadyl IV (oxovanadate IV) ion is a blue colorant, in these apophyllites it's of such low concentration that it's only green; a few apophyllites do tend towards a bluish-green tint. It's theorized that a high enough concentration of vanadyl IV ions during crystallization would result in blue apophyllites - none have been found (yet).

Row 8

Apophyllite

This is the yellowest apophyllite I've seen - like most good apophyllite, this miniature's from India.

Thanks to Dean Johnstone at mineralsfromindia.com for the specimen!

Apophyllite

Sometimes apophyllite has clay-like mica (celadonite) inclusions (larger picture, closeup), making it appear black. This miniature from India has a beatiful doubly-terminated crystal on a clay-coated matrix along with small gyrolite spherules.

Thanks to Dean Johnstone at mineralsfromindia.com for the specimen and the information on apophyllite inclusions!

Apophyllite
on Natrolite

A miniature of very tabular apophyllite on twinned natrolite from Poona, India.

Thanks to Dean Johnstone at mineralsfromindia.com for the information on apophyllite habits!

Row 9

Apophyllite

A 2-inch doubly-terminated apophyllite.

Thanks to Dean Johnstone at mineralsfromindia.com for the specimen and the image!

Apophyllite

A pretty miniature of red included apophyllite from Raigad, India.

Thanks to Rory Howell's auction on eBay for the specimen!

Bementite

A miniature of massive brown bementite (a manganese hydroxysilicate) with franklinite and calcite on matrix from the type locality of the Franklin Mining District, Sussex County, New Jersey.

Thanks to Christopher O'Neill's auction on eBay for the specimen!

Row 10

Biotite

A small cabinet book of biotite mica from the Consolidated No. 1 Quarry in Topsham, Sagadahoc County, Maine. There's a very nice (and rare) pseudohexagonal crystal at the lower left.

Thanks to Dennis Brown's auction on eBay for the specimen!

Biotite

A pretty miniature of black biotite schist from (probably) Mount Etna in Italy.

Thanks to Lynda McDowell's auction on eBay for the specimen!

Carletonite

This cabinet specimen of carletonite's (a hydrated potasssium sodium calcium carbonatosilicate) one of the many unique (and recent - 1978) minerals from the famous Mont St. Hilaire locality (type locality - Poudrette Quarry) - like other members of the apophyllite group, it has interconnected four and eight-member rings.

Thanks to Darrel Merke's auction on eBay for the specimen and the images!

Row 11

Carletonite

A tiny but bright blue partial crystal of carletonite also from the Poudrette Quarry.

Thanks to Frank P. Butler's auction on eBay for the specimen and the image!

Cavansite

Cavansite is a "new" mineral - it's only been recognized for 30 years or so. The electric blue color is diagnostic and usually occurs (as here) on a stilbite "wheat sheaf" ground. Its name comes from its composition - a CAlcium VANadium Silicate (the vanadium is responsible for the blue coloring). This small cabinet specimen (as are most) is from Poona, India. It's dimorphic with pentagonite.

Cavansite and
Pentagonite

A rare miniature of intergrown cavansite and pentagonite (dimorphs) on a tuff matrix from the type locality for both minerals (near Owyhee Dam, Lake Owyhee State Park, Malheur County) in Oregon. From the John Byland collection, purchased in 1971 for $100.

Thanks to Steve & Susan Bringe's (Summit Minerals) auction on eBay for the specimen!

Row 12

Cavansite

A very rare "bow tie" micromount of cavansite - these are almost impossible to find.

Thanks to Val Collins' auction on eBay for the specimen!

Celadonite

This miniature of massive celadonite (another member of the mica family) is not only from the type locality of Mount Baldo, Sano, Verona Province, Veneto, Italy, but may also be a piece of the original (analyzed) celadonite specimen! Celadonite is also one of the two pigments comprising "Green Earth" (Stone Green, Terre Verte, Verdetta, Celadon Green).

Thanks to Thomas Bee's auction on eBay for the specimen and the image!

Chamosite
on Quartz

A miniature of terminated quartz crystals with beautiful overgrowths of dark green to black chamosite "balls" and several dolomite and pyrite crystals from the now-closed Homestake (gold) Mine near Lead, Lawrence County, South Dakota.

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen and the image!

Row 13

Chamosite

Am excellent hand specimen of botryoidal light-green chamosite on a quartz matrix from the Poudrette Quarry, Mont Saint-Hilaire, Monteregie, Quebec. There's a tan siderite crystal present (larger image, top row, right).

Thanks to Kerry Day's (Kaygeedee Minerals) auction on eBay for the specimen!

Chamosite,
var. Bavalite

A beautiful thumbnail of a deep bluish-green bayalite vein in matrix from the closed Penlee quarry, Penzance, Cornwall, England. Ex: Phillips Collection with a Cureton dealer tag. There's a couple of different formulas for bavalite and one reference opines that bavalite from Chamoson should be the true chamosite.

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen and the images!

Chernykhite

A 3mm chip of dark-green chernykhite (a barium-vanadium mica) on matrix from the type locality of the vanadium-bearing shales of Balasauskandyk, Southern Kazakhstan Province, Kazakhstan. It has a Tony Jones' dealer tag from 2010.

Thanks to David H. Garske's auction on eBay for the specimen and the image!

Row 14

Chlorite
on Calcite

Brownish-green microscopic chlorite crystals coat this pair of calcite scalenohedrons from Val Mulina, Luckmanier, Switzerland.

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen!

Clinochlore

Clinochlore, like chlorite and chamosite, is a member of the chlorite subfamily of phyllosilicates. This small cabinet piece of beautiful translucent green clinochlore on a topazolite matrix is from the Yellow Cat Mine, New Idria district, San Benito County, California.

Thanks to Dave Hayward at Lucky Strike Minerals for the specimen and the image!

Clinochlore, var.
Aphrosiderite
after Almandine

This unusual miniature of aphrosiderite (ferroan clinochlore, also called ripidolite) after almandine comes from the Michigamme Mine, Michigamme, Michigan.

Thanks to Vince Olsovsky's auction on eBay for the specimen!

Row 15

Clinochlore, var.
Colerainite

From the type locality for clinochlore - Brinton's Quarry, West Chester, Westtown Township, Chester County, Pennsylvania - comes this beautiful large thumbnail of thick, off-white hexagonal plates (some hoppered) of colerainite, a seldom seen variety of clinochlore. Ex Ron Sloto and William Yocum Collections.

Thanks to Emilie & Ron's auction on eBay for the specimen!

Clinochlore, var.
Delessite

An excellent miniature of green delessite (iron-bearing clinochlore - or magnesium-bearing chamosite) spheroids on matrix from the Votrubec quarry, Kozákov, Liberec Region, Bohemia, Czech Republic.

Thanks to Robert Vano's auction on eBay for the specimen and the images!

Clinochlore, var.
Diabantite

A small cabinet of dark-green diabantite (a ferroan clinochlore - implying more iron than delessite) on matrix with apophyllite, heulandite, and stilbite from the quarry near Laurel Hill, Secaucus, Hudson County, New Jersey. Ex: Alan "Bundy" Beres Collection.

Thanks to Eric Stanchich's auction on eBay for the specimen and the images!

Row 16

Clinochlore,
var. Kotschubeite

An excellent thumbnail of kotschubeite (chromian clinochlore) from the varietal type locality of the Karkadinsk Mine, Kartali River, Ufaleisk, Ural Mts, Russia. The closest match I can find in MinDat is the demantoid deposit at Korkodinskoe. Most refences consider kotschubeite and kammererite to be the same mineral even though the crystallography and the chromium content differ.

Thanks to Dieter Obrecht's The NetMine auction on eBay for the specimen!

Clinochlore,
var. Pennine

Pennine (penninite) is the pseudo-trigonal habit (dimorph?) of monoclinic clinochlore. This thumbnail of a sharp dark-green pennine crystal on matrix comes from Gorb, Lercheltin, Binn Valley, Wallis, Switzerland.

Thanks to Csanad Loranth's auction on eBay for the specimen and the images!

Clinochlore, var.
Pennine, var.
Kämmererite

The chromium-rich variety of pennine (an iron magnesium aluminum hydroxysilicate) is called kämmererite - this miniature, like most of the good ones, comes from Kop Daglari, Erzurum, Eastern Anatolia, Turkey.

Thanks to Dave Hayward at Lucky Strike Minerals for the specimen and the image!

Row 17

Clinochlore, var.
Pennine, var.
Kämmererite

Sometimes kämmererite occurs as matted fibrous crusts as in this little miniature from the Little Castle Creek chromium mine, Castle Crag, Klamath Mts, Shasta County, California.

Thanks to Tom Lettier and Ken Balthazor's (The California Crystal Connection) auction on eBay for the specimen!

Clinochlore, var.
Pennine, var.
Kämmererite

An old odd kämmererite miniature from the Wood's Chrome Mine, Texas, Lancaster County, Pennsylvania. The surface has weathered to a waxy fluorescent coating but the closeup (larger image, top right) shows a beautiful raspberry-red area. The larger image also displays the two old tags, the later one from Poughkeepsie College 1938 - both tags refer to the varietal "penninite" name for clinochlore.

Thanks to Tony Nikischer at the Excalibur Mineral Company for the specimen!

Clinochlore, var.
Leuchtenbergite

Leuchtenbergite is the varietal name of iron-poor clinochlore - this (literal) museum piece comes from Shiskimskaya Mountain, Zlatoust, Urals, Russia via the former University of Helsinki Mineralogical Museum (now a department of the Finnish Museum of Natural History). The larger image (bottom row, center and right) displays the provenance.

Thanks to Tony Nikischer at the Excalibur Mineral Company for the specimen!

Row 18

Clinochlore, var.
Seraphinite

The massive compact variety of clinochlore is called seraphinite - it's often cabbed and polished for jewelry. This small cabinet specimen is from eastern Siberia, Russia near Lake Baikal - the type locality for this varietal.

Thanks to Wright's Rock Shop's table at the 2002 Carnegie Gem & Mineral Show for the specimen!

Clinochlore, var.
Sheridanite

A good miniature of sheridanite (aluminum-rich clinochlore) from the varietal type locality of North Diney Creek, Sheridan County, Wyoming. Ex: Ralph E. Merrill Collection and Mineral Zone and David Shannon Minerals dealers.

Thanks to David H. Garske's auction on eBay for the specimen!

Clintonite

A beautiful small cabinet specimen of sharp pseudohexagonal crystals of dark-green clintonite (another mica family member) crystals on matrix (collected in 1996) from the famous Green Monster Mountain, Prince of Wales Island, Alaska.

Thanks to Steve & Susan Bringe's (Summit Minerals) auction on eBay for the specimen and the image!

Row 19

Cronstedtite

Another member of the serpentine group, this cluster of iron-rich cronstedite crystals on matrix comes from the Wheal Maudlin, Lanlivery, St Austell District, Cornwall, England.

Thanks to Kevin Conroy at (Kevin Conroy Minerals) for the specimen and the image!

Dickite

Yet another member of the serpentine-kaolinite group, this miniature of tiny dickite (an aluminum hydroxysilicate) crystals coating quartz from a strip mine (Saint Clair) near the fire station in Frackville, Schuylkill County, Pennsylvania. It's a tetramorph with halloysite, kaolinite, and nacrite.

Thanks to Lee Rogers' auction on eBay for the specimen and the image!

Dickite

A micro of sub-millimeter white dickite aggregates in matrix from Cap d'Agde, Hérault, Languedoc-Roussillon, France. The whitish rhombs are probably calcite.

Thanks to Paolo Bracci's auction on eBay for the specimen and the image!

Row 20

Donbassite

A miniature of pearly pinpoints and tabular flakes of donbassite (an aluminum hydroxyaluminosilicate member of the chlorite group) on dark matrix from the Nesquehoning Coal Mine near Nesquehoning, Lansford, Carbon County, Pennsylvania. Lithium can replace some of the aluminum (up to 2%) but does not complete the series to cookeite.

Thanks to Tony Nikischer at the Excalibur Mineral Company for the specimen!

Dozyite, var.
Chromian Dozyite

Lots of millimeter-sized purple chunks of chromian dozyite from the (now closed to collectors) Wood's Chrome Mine, Texas, Little Britain Township, State Line Chromite District, Lancaster County, Pennsylvania. Dozyite's composition is halfway between clinochlore and amesite - the chromium gives it the purple color.

Thanks to Amanda Larson's auction on eBay for the specimen!

Eastonite

Three large miniatures of yellow-green eastonite (mica) from the type locality of the C.K. Williams Quarry in Easton, Northampton County, Penssylvania. Though recent studies have shown that eastonite is a submicroscopic mixture of phlogopite and serpentine - the serpentine is, in turn, a "previously unreported and microstructurally complex, disordered polysomatic mixture of the lizardite and antigorite structures" [Yoder, unpublished], current literature merely lists it as an aluminum magnesium potassium mica, forming a series with siderophyllite where iron replaces the magnesium.

Thanks to Keith Robertson's auction on eBay for the specimens!

Row 21

Effenbergerite

An excellent micro of a tiny bright blue speck of effenbergerite (a barium copper tetrasilicate) on sugilite from the type locality of the Wessels Mine, Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa. The effenbergerite even shows up well with a lot of light on the specimen! It's a member of the gillespite group.

Thanks to Paolo Bracci's auction on eBay for the specimen and the photo!

Eirikite

An excellent micro of a white eirikite spray on microcline from the type locality of Larvik, Vestfold, Norway - probably one of the Vesle Arøya island pegmatites in Langesundsfjorden. Formerly classified as a tectosilicate because of its "transitional structure", eirikite is the potassium analog of #leifite and telyushenkoite, the current members of the leifite group.

Thanks to Amanda Larson's auction on eBay for the specimen!

Ellingsenite

A large thumbnail of white ellingsenite laths on a phonolite matrix from the type (and only) )locality of the Aris Quarry, Windhoek, Khomas region, Namibia.

Thanks to Csanad Loranth's auction on eBay for the specimen and the images!

Row 22

Ephesite

A beautiful micro of pink ephesite (a lithium mica) on matrix from Colsam, Postmasburg, Northern Cape Province, South Africa. The closeup image (larger image, right) FOV is 9mm.

Thanks to Chris Stefano's Christopher J. Stefano Fine Minerals auction on eBay for the specimen and the image!

Fedorite

A miniature cluster of pearly beige fedorite (a complex hydrated calcium sodium potassium silicate) from the Murun massif, SW of Oekminsk, Yakutia, Russia.

Thanks to David H. Garske's auction on eBay for the specimen!

Ferripyrophyllite

A miniature of massive brown ferripyrophyllite from Swakopmund, Erongo Region, Namibia. Ex: Volkwein Collection (#F2-9). It's the ferric iron analog of pyrophyllite.

Thanks to Dieter Obrecht's The NetMine auction on eBay for the specimen and the images!

Row 23

Ferroceladonite

Deep-green ferroceladonite crystals in a typical thumbnail from the Poudrette Quarry, Mont Saint-Hilaire, Monteregie, Quebec. There's almost a complete series between feeroceladonite and celadonite (where magnesium replaces the ferrous iron).

Thanks to Arnaldo Brunetti's auction on eBay for the specimen and the image!

Fivegite

On this micro, fivegite forms translucent mica-like hydrothermal alteration rims on a pale-gray more opaque delhayelite crystal fragment from the type and only locality of the Central Mine, Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Russia. The alteration of fivegite from delhayelite usually continues to hydrodelhayelite, though I don't see any here. The tiny black crystals are probably aegirine.

Thanks to Csanad Loranth's auction on eBay for the specimen and the images!

Fluorannite

A row of black fluorannite crystals comprise this miniature from the Katugin Ta-Nb deposit, Transbaikalia in eastern Siberia, Russia. It's the fluorine analog of annite and the ferrous analog of fluorophlogopite.

Thanks to Kristen Burgess' auction on eBay for the specimen!

Row 24

Fluorophlogopite

One of many (larger image, right) light-peach transparent crystals of fluorophlogopite highlight this thumbnail from the La Aljorra Quarries, La Aljorra, Cartagena, Murcia, Spain. It's the magnesium analog of fluorannite and the fluorine analog of phlogopite. Synthetic fluorophlogopite, "fluorine mica", has a multitude of uses, among them; bulking agent for cosmetics, machinable low-expansion ceramics, batteries, and pigments.

Thanks to Paolo Bracci's auction on eBay for the specimen and the image!

Friedelite

A somewhat cuttable miniature of rose friedelite on matrix from the Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey. Ex: Mary and George Pawluchik collection.

Thanks to John Cianciulli's auction on eBay for the specimen!

Ganophyllite

A nice small miniature of light-orange ganophyllite (a manganese mica) crystals with colorless and smoky quartz on matrix from the Valgraveglia Mine, Reppia, Graveglia Valley, Ne, Genova Province, Liguria, Italy. It's the potassium analog of eggletonite.

Thanks to Darrel Merke's (Proton Minerals) auction on eBay for the specimen and the images!

Row 25

Garnierite

Garnierite is either a synonym for falcondoite, nepouite, or a generic name for a mix of nickel (serpentine) silicates - this miniature was collected in 1980 at the now-depleted Riddle (nickel) Mine, Nickel Mountain, Riddle, Douglas County, Oregon. It's often slabbed or cut en cabochon.

Thanks to Eva Stern's auction on eBay for the specimen!

Garnierite

Another garnierite miniature from the Riddle Mine - this piece was collected in 1971.

Thanks to Kraig Kessler's auction on eBay for the specimen and the image!

Garnierite

Garnierite from the Poro Mine, Poro, New Caledonia has a distinctly different color and texture than that from the nearby Thio mine - this miniature was collected prior to its closing in the early 1980s. Most of the jewelry-grade garnierite comes from New Caledonia.

Thanks to Kraig Kessler's auction on eBay for the specimen and the image!

Row 26

Gillespite

An excellent miniature of deep-red gillespite (a barium iron "tetrasilicate") cleavages in matrix from the Gun Claims, MacMillian Pass, Itsy Mountains, Yukon Territory, Canada. There's also orange-brown muirite and white sanbornite present. Ex: Donald Cooke Collection. A synthetic gillespite group (barium magnesium) silicate has been studied as a rare-earth host for improved white LEDs.

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen and the images!

Gonyerite

A miniature of glassy red-brown gonyerite (a manganese member of the chlorite group) clusters with massive almandine and hausmannite throughout the matrix from the type locality of Sjovarp, Langban, Filipstad, Varmland, Sweden. Ex: Volkwein Collection (#G2-23).

Thanks to Dieter Obrecht's The NetMine auction on eBay for the specimen and the images!

Günterblassite

The red arrow points to one of many groups of colorless tabular gunterblassite crystals on this basalt miniature from the type locality of the Mount Rother Kopf basalt quarry, Roth, Vulkaneifel, Germany. It's the first triple-layer phyllosilicate which gives it a structure approaching a tectosilicate.

Thanks to Thomas Kleser's auction on eBay for the specimen and the image!

Row 27

Gyrolite

An excellent miniature of greenish gyrolite (a hydrated calcium hydroxysilicate) balls on a drusy quartz matrix, probably from Poona, Maharashtra State, India.

Thanks to The $ource's auction on eBay for the specimen!

Halloysite

A miniature aggregation of halloysite (an aluminum hydroxysilicate) from Lawrence County, Indiana - formerly in the James Underhill Collection. It's a tetramorph with dickite, kaolinite, and nacrite.

Thanks to C. Carter Rich's table at the 2002 Carnegie Gem & Mineral Show for the specimen!

Hectorite

A miniature of snow-white hectorite (a smectite group (clay) mineral) from the type locality of the Hector Mine, Hector, San Bernardino County, California.

Thanks to Jonathan Green's auction on eBay for the specimen!

Row 28

Hendricksite

Beautiful reddish-black sheets of hendricksite mica (more info) with willemite and andradite comprise this specimen from the type locality of Franklin, New Jersey - one of the times when the color description exactly matches what you see. It's the zinc analog of phlogopite. This small cabinet specimen is from the collection of Peter Van Horne.

Thanks to David Selem's auction on eBay for the specimen and the images!

Hisingerite

A miniature of acicular brown hisingerite (a hydrated iron hydroxysilicate) on matrix from Apatitovyi Tsirk, Rasvumchorr Mountain, Khibiny, Kola Peninsula, Russia. It's usually an alteration product of an iron-rich environment.

Thanks to Ingo Drescher's auction on eBay for the specimen!

Hydrodelhayelite

A small thumbnail of light-brown cleavages of hydrodelhayelite with green aegirine from the Kirov Apatite Mine, Khibiny Massif, Kola Peninsula, Northern Region, Russia.

Thanks to Csanad Loranth's auction on eBay for the specimen and the image!

Row 29

Imogolite

One of the very few minerals with a tubular structure, this gelcap of imogolite (a clay mineral related to allophane) from Fukaiwa, Kanuma City, Tochigi Prefecture, Kanto Region, Honshu Island, Japan may have applications as a shape-selective catalyst and as an anion-exchange medium (especially for phosphates).

Thanks to Paolo Bracci's auction on eBay for the specimen and the images!

Kampfite

Light-blue grains of kampfite (a barium silicate-carbonate) in matrix and associated with sanbornite, titantaramellite, celsian, and bazirite comprise this miniature from the type locality of the Esquire No. 1 Claim, Rush Creek, Fresno County, California. Ex: Phillips Collection with an Excalibur Mineral Corp. tag, from 10/2000.

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen and the images!

Kanemite

A beautiful and rare large thumbnail of white kanemite (sodium disilicate trihydrate) blades on matrix from the Aris Quarries, Aris, Windhoek District, Khomas Region, Namibia. Synthetic kanemite is used in detergents to protect delicate fabrics and to keep oxygen bleaches from weakening fabrics.

Thanks to Grzegorz Bijak's auction on eBay for the specimen and the images!

Row 30

Kaolinite

A hand specimen of kaolinite (aluminum hydroxysilicate - the traditional pottery "clay") from Mono County, California.

Thanks to Vince Olsovsky's auction on eBay for the specimen!

Kaolinite, var.
Miloschite

A vial of blue grains of miloschite (chromian kaolinite) from (probably) the Sonoma Mine in Guerneville, Coast Range, Sonoma County, California.

Thanks to Jonathan Green's auction on eBay for the specimen!

Kinoshitalite

A small miniature of millimeter-sized flakes of light-yellow kinoshitalite (a barium mica) on a probably tephroite matrix from Kamocha, Sohraku-gun, Kyoto Prefecture, Kinki Region, Honshu Island, Japan.

Thanks to David H. Garske's auction on eBay for the specimen!

Row 31

Latiumite

White tabular crystals of latiumite (a complex calcium potassium silicate) cover the matrix of this miniature from the type locality of the Alban Hills, Campagnano, near Rome, Italy.

Thanks to Tony Jones' auction on eBay for the specimen!

Leifite

A nice thumbnail of almost colorless, radiating leifite (an aluminum sodium beryllium silicate) tufts on matrix from the Poudrette Quarry, Mont Saint-Hilaire, Monteregie, Quebec. Once considered an unclassified and / or tectosilicate, leifite is now a three-member group whose structure allows for a few more (as yet unfound) minerals.

Thanks to Reiner Mielke'sauction on eBay for the specimen and the images!

Leifite

A second leifite thumbnail from Mont Saint-Hilaire displays larger and whiter sprays.

Thanks to Reiner Mielke'sauction on eBay for the specimen and the images!

Row 32

Lepidolite

Lepidolite is a pink-to-lavender lithium-bearing mica that occurs in massive chunks and rarely in crystals. This one's from San Diego County, California. It's mined as a source of lithium.

Lepidolite

A cute thumbnail of curved lepidolite from San Diego County, California.

Thanks to Dan Wienrich at Dan & Jill Weinrich for the specimen and the image!

Lepidolite

This lovely chunk of lepidolite mica is from Brazil.

Row 33

Lepidolite

A beautiful compressed stacked array of lepidolite from Minas Gerais, Brazil - backlit, it's a gorgeous pinkish lavender. This piece, like the stacked phlogopite "diamonds" from the Shewa Pegmatite Field, Badakhshan Province, Afghanistan, is cohesive enough to cut.

Thanks to M. Phantom Minerals' table at the 2000 Carnegie Gem & Mineral Show for the specimen!

Lepidolite

A small cabinet compact raspberry lepidolite from Minas Gerais, Brazil. The closeup shows the beautiful translucent color.

Thanks to Wright's Rock Shop's table at the 2001 Carnegie Gem & Mineral Show for the specimen!

Lepidolite

Lepidolite can also be yellow, as occurs here on this large cabinet chunk of smoky quartz pegmatite from the Tin Mountain Mine (Custer County) located in the Black Hills of South Dakota. The larger image shows a couple of (broken off) cassiterite crystals - you can see the teragonal cross section - and probable red microlite.

Thanks to Terry Spring's auction on eBay for the specimen!
Thanks to Tom Loomis for the microlite identification.

Row 34

Lepidolite

A cute thumbnail of lepidolite.

Thanks to Eric Greene's (Treasure Mountain Mining) for the specimen!

Lepidolite

A bicolor lepidolite miniature from Araçuaí, Minas Gerais, Brazil.

Thanks to Lourenço Santos' auction on eBay for the specimen!

Lepidolite

A yellow, lavender, and pink lepidolite from the type locality - Rozna, NE of Velke Mezirici, Jihomoravsky, Moravia, Czech Republic.

Thanks to Jan Garland's (Fine Rocks) auction on eBay for the specimen!

Row 35

Lepidolite

A dark-lavender lepidolite miniature from the Yukon Territory in Canada.

Thanks to Lee Rogers' auction on eBay for the specimen and the image!

Lepidolite

A beautiful translucent stack of lepidolite from Itinga, Araçuaí, Minas Gerais, Brazil.

Thanks to Joseph George's (Cascade Scepters) auction on eBay for the specimen!

Lizardite

A beautiful polished 13.5cm slab of green lizardite (magnesium hydroxydisilicate) in contrasting white dolomite from the Redziny dolomite quarry near Czarnów, Rudawy Janowickie Mts, Lower Silesia, Poland. It forms a complete series with nepouite and is the most common serpentine species.

Thanks to Anna Jachymiak's auction on eBay for the specimen and the images!

Row 36

Loughlinite

An excellent rare thumbnail of shale-vein-filling loughlinite (a hydrated magnesium sodium "cyclotrisilicate") fibers from the type locality of the Westvaco mine, Green River formation, Sweetwater County, Wyoming. Ex: Robert Frederickson collection and has a 2011 Mineral Zone tag. It's a member of the sepiolite group.

Thanks to David H. Garske's auction on eBay for the specimen!

Makatite

This miniature of white crystal aggregates of makatite, a rare sodium hydroxysilicate, on matrix is from Lake Umbozero, Karnasurt Mountain, Lovozero Massif, Kola Peninsula, Russia. It fluoresces light yellow under longwave UV. The name comes from the Masai (Kenyan) word for soda, emakat.

Thanks to Thomas Bee's auction on eBay for the specimen!

Makatite

A miniature of white makatite sprays on matrix from the Aris Quarry, Windhoek, Windhoek District, Khomas Region, Namibia.

Thanks to Krzysztof Dembicz' Spirifer Minerals auction on eBay for the specimen and the images!

Row 37

Manandonite

Manandonite's another member of the serpentine subfamily - this miniature of tiny pale pink rosettes on matrix is from the type locality, Antandrokomby, Sahatany Valley, Madagascar.

Thanks to Dave Hayward at Lucky Strike Minerals for the specimen and the image!

Margarite

Collected in 1991 by Eric Greene from the famous Wright Emery Mine at Chester, Massachusetts, this is a small cabinet specimen of margarite (a pink mica) plates in matrix.

Thanks to Eric Greene's (Treasure Mountain Mining) auction on eBay for the specimen and the images!

Mariposite

Mariposite isn't a well-defined mineral - it's a chromium phengite; a green mica series between the aluminoceladonite muscovite and celadonite muscovite series. (The nomenclature and classification of the 40-odd mica minerals is very complex). This miniature is from the Hardrock Mine in the type locality of Mariposa County, Califormia and is in a quartzite matrix along with small pockets of brown microscopic crystals. These pockets also contain tiny flakes of gold (larger picture, bottom).

Thanks to Leland Goodwin's auction on eBay for the specimen!

Row 38

Mariposite

Recently, mariposite has become popular for slabbing - this beautiful three-pound museum piece with milky quartz veins is also from California.

Thanks to Lesli Mallory's auction on eBay for the specimen and the images!

Montmorillonite

Pink montmorillonite (one of the clay minerals) on an albite matrix from the Tamminen Quarry, Greenwood, Oxford County, Maine. The pink color is probably due to manganese as there are also tiny flecks of (probably) pyrolusite present.

Thanks to Veronica Matthews's auction on eBay for the specimen!

Muscovite
Pegmatite

One of two "aquarium stones" from a former colleague, this is a beautiful 9-inch chunk of muscovite pegmatite. Some of the micas are an inch across. Thanks Dr. Bob!

Row 39

Muscovite

Beautiful lime-green muscovite from the early 2000 find in Minas Gerais, Brazil.

Muscovite

Two muscovite books from Mount Mica mine near Paris, Oxford County, Maine.

Thanks to Dennis Brown's auction on eBay for the specimens!

Muscovite

Pink muscovite on matrix from Minas Gerais, Brazil. The larger picture shows both specimens.

Row 40

Muscovite

This was labeled "rose mica" and it certainly is a darker pink than any lepidolite I've seen - this thumbnail of rose muscovite is from the Harding Mine, Dixon, Taos County, New Mexico. The color is due primarily to iron - the ratio of iron to manganese (as oxide) is about 3:1 here and 4:1 at nearby Pilar.

Thanks to the Carnegie Natural History Museum Store for the specimen!

Muscovite

This is a beautiful miniature of "star mica" from the early 2000 find in Aracuai, Minas Gerais, Brazil.

Thanks to Roger Hoek's (ARCH Minerals) auction on eBay for the specimen!

Muscovite

More a rock than a mineral, the silvery muscovite books are aligned (larger piocture, right) in this quartz matrix.

Thanks to Martha Crawford's auction on eBay for the specimen!

Row 41

Muscovite

A beautiful but highly unusual cross-section of muscovite from Coronel Murta, Minas Gerais, Brazil - the reason for the abrupt color change from silver to yellow is unknown.

Thanks to Tony Nikischer at the Excalibur Mineral Company for the specimen!

Muscovite

This is a beautiful book of ruby "trapiche" muscovite - the inclusion has caused a six-rayed star to form. It's from Africa.

Thanks to Gem-Fare's table at the 2001 Carnegie Gem & Mineral Show for the specimen!

Muscovite

Beautiful bright red (colored by hematite) muscovite on quartz from Nipissing, Ontario, Canada - one of the very few places it occurs.

Thanks to Thomas Taaffe's auction on eBay for the specimen!

Thanks also to Mark Heintzelman for the hematite colorant info!

Row 42

Muscovite

This sharp miniature of tan muscovite comes from somewhere in Mitchell County, North Carolina.

Thanks to Charles Creekmur's auction on eBay for the specimen and the image!

Muscovite

This thumbnail of red muscovite is from North Bay, Ontario, Canada.

Thanks to Frank Butler's auction on eBay for the specimen and the image!

Muscovite

A beautiful small cabinet muscovite rose from Minas Gerais, Brazil.

Thanks to Nicole Gariepy's auction on eBay for the specimen and the image!

Row 43

Muscovite

A pretty miniature of tan "star" muscovite on quartz from Scotland.

Thanks to Janalynn Brewer's auction on eBay for the specimen!

Muscovite

A museum piece of fine-grained red muscovite / quartz "schist" from Ontario, Canada. This material was originally ground up and used for road surfaces, but the glitter proved too distracting!

Thanks to Don Bray & Robert Bressler's auction on eBay for the specimen and the images!

Muscovite

A beautiful miniature of compact bright yellow muscovite rosettes from the Jaguaracu Pegmatite, Jaguaracu, Minas Gerais, Brazil. The yellow coloring is caused by iron and lithium impurities - as described in the May/June 1994 Mineralogical Record. I enhanced the contrast of the rosette closeup (larger image, bottom) to more clearly show the compact rosette "petals".

Thanks to David Von Bargen at the MSA for the identification and the MinRec reference!

Row 44

Muscovite

A small cabinet specimen of blue-gray mica from Talcville, St. Lawrence County, New York.

Thanks to Joe Vasichko's Rockmanjoe Minerals auction on eBay for the specimen and the image!

Muscovite

An esthetic small cabinet specimen of a muscovite rosette on pink microcline from Minas Gerais, Brazil.

Thanks to Dave & Liz Douglass' (Douglass Minerals) auction on eBay for the specimen and the images!

Muscovite,
var. Alurgite

This small cabinet specimen of alurgite on matrix is from the Praborna Mine, St. Marcel, Aosta, Italy. It's named after the Greek word for sea-purple, halourges; a reddish-purple dye extracted from the murex shell - the most expensive dye known in antiquity.

Thanks to Allison Bada's auction on eBay for the specimen!

Row 45

Muscovite,
var. Fuchsite

A large cabinet specimen of beautiful light-green muscovite mica (fuchsite) - the same mineral that gives aventurine its color and often has garnets riding on it. The green coloring is due (as is often the case) to a trace amount of chromium. It's named after J. N. von Fuchs, a German chemist.

Muscovite,
var. Plumose

This small cabinet piece shows an extremely rare habit variety of muscovite called "plumose mica" - it comes from near Usk, Pend Oreille County, Washington on the Idaho - Washington border. From the tag -

"In the mid 60's a small mine in Northern Idaho ran into a small deposit of this material. A sample was sent to the Smithsonian where they named it and reported it to be the only deposit in existence at that time. The material was very limited and the mine was abandoned."

Other plumose muscovites have been found since, notably from the Hale's Quarry near Glastonbury, Hartford County, Connecticut and the Superior Rock Company Quarry in Randville, Dickinson County, Michigan.

Thanks to Keith Ludemann's auction on eBay for the specimen and the images!

Thanks also to Steve Kelland for the Connecticut locale & David Schuder for the Michigan locale!

Muscovite,
var. Sericite

Sericite's the name given to the fine-grained compact variety of white muscovite. This miniature's from the Mount Hope Quarry in Adams County, Pennsylvania.

Thanks to Vince Olsovsky's auction on eBay for the specimen!

Row 46

Nacrite

A small cabinet specimen of nacrite on a dolostone/qaurtz matrix from Saint-Eustache, Montréal, Québec, Canada. It's a tetramorph with dickite, halloysite, and kaolinite.

Thanks to Kerry Day's (Kaygeedee Minerals) auction on eBay for the specimen and the image!

Nanpingite

This is a cesium and tantalum-bearing yellow mica (probably nanpingite) from the McCallister tantalum pegmatite in Coosa County, Alabama.

Thanks to Jennings "Beau" Gordon's (Jendon Minerals) auction on eBay for the specimen!

Nepouite

A small cabinet specimen of nepouite (a nickel magnesium hydroxysilicate) probably from the type locality of the Népoui Mine, Noumea, New Caledonia. This material is often marketed as garnierite. It's the orthorhombic dimorph of pecoraite.

Thanks to Steve & Susan Bringe's (Summit Minerals) auction on eBay for the specimen and the image!

Row 47

Nontronite

A miniature of green nontronite (a hydrated iron sodium hydroxyaluminosilicate and a member of the smectite group in the clay family) from Wilson Springs, Garland County, Arkansas. The contrasting colors of the nontronite and the matrix are beautiful! Ex; Harry Uhl collection and collected in the 1960s.

Thanks to Jennings "Beau" Gordon's (Jendon Minerals) auction on eBay for the specimen!

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Nontronite

An excellent miniature of yellow nontronite from the Kongsberg Silver Mining District, Kongsberg, Buskerud, Norway.

Thanks to Salvatore Natalizia's auction on eBay for the specimen and the image!

Nontronite

Nontronite can also be dark-brown as in this thumbnail of tiny nontronite crystals on albite from the Poudrette Quarry, Mont Saint-Hilaire, Monteregie, Quebec.

Thanks to Darrel Merke's (Proton Minerals) auction on eBay for the specimen and the images!

Row 48

Oxyphlogopite

Tiny translucent red-brown crystals of oxyphlogopite on matrix comprise this small miniature from the type locality of the Rothenberg basalt quarry, Bell, Mendig, Eifel, Rhineland-Palatinate, Germany.

Thanks to Stefano Broetto's auction on eBay for the specimen and the images!

Palygorskite

A miniature of palygorskite (a hydrated magnesium aluminum hydroxysilicate and a member of the clay group) - it's also called "mountain leather" and attapulgite. I don't have a locale for this specimen.

Thanks to Nature's Expressions' table at the 2003 Carnegie Gem & Mineral Show for the specimen!

Paragonite

When the potassium in muscovite is replaced by sodium, it becomes paragonite - this beautiful dark gold miniature comes from the Williamson Valley in Arizona.

Thanks to David H. Garske's auction on eBay for the specimen!

Row 49

Parsettensite

A micromount of brown parsettensite (a manganese-rich member of the stilpnomelane family) plates from the Foote Mine, King's Mountain, North Carolina.

Thanks to Don Smoley's Minerals & Gems table at the 2002 Carnegie Gem & Mineral Show for the specimen!

Pecoraite

A nice minaiture of pale green pecoraite (a nickel magnesium hydroxysilicate) on matrix from the Otway Nickel deposit, Nullagine, East Pilbara Shire, Western Australia, Australia. It's the monoclinic dimorph of nepouite and can is the nickel analog of chrysotile.

Thanks to Jake Slagle's Maryland Minerals auction on eBay for the specimen and images!

Penkvilksite

A miniature of white massive penkvilksite (a hydrated sodium titanosilicate) from the type locality of the Yubileinaya pegmatite, Karnasurt Mt, Lovozero Massif, Kola Peninsula, Northern Region, Russia. Synthetic penkvilksite is being considered for 60Co adsorption.

Thanks to Kristen Burgess' auction on eBay for the specimen!

Row 50

Pennantite

A thumbnail of reddish-brown pennantite (a trioctahedral manganese chlorite) on matrix from the Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy.

Thanks to Brad Hilken's auction on eBay for the specimen!

Phlogopite

A small-cabinet-sized book of green phlogopite mica - like most micas, phlogopite's mined for electrical and thermal insulation uses. This one's from the Kola Peninsula in Russia.

Thanks to Walter Mroch at The Gem and Mineral Exploration Company for the specimen and the image!

Phlogopite

A crumpled book of golden-brown phlogopite from the Kodiak/Kitty Lynch Mine, Wakefield, Quebec, Canada.

Thanks to Darrel Merke's auction on eBay for the specimen!

Row 51

Phlogopite

Beautiful booklets of coppery phlogopite - some of them (first row, center and right) are compact enought to cut - on quartz from Badakhshan, Afghanistan. The quartz has a green tourmaline and some (probable) rutile hairs (third row).

Phlogopite

A small cabinet book of dark greenish-brown phlogopite, probably from Brazil.

Phlogopite

This wonderful old 8" x 8" phlogopite sheet is from Canada - the label (larger image, bottom) bears the hand-written notation "Phlogopite with phantom, Canada - July 31, 1893" and identifies the piece as being from the collection of Wallace Goold Levison. Professor Levison was a scientist and mineralogist of great note, circa 1860 - 1920. He was the first editor of "American Mineralogist" magazine in 1919, a well-published member of the Brooklyn Institute of Arts and Sciences and is credited by many as being the inventor of the first movie camera.

Thanks to Carl Bentley's auction on eBay for the specimen, the images, and the Levison info!

Row 52

Phlogopite

A sharp phlogopite crystal in gray calcite comprises this thumbnail from the Earle's Farm Fluororichterite occurrence, Monmouth Township, Haliburton County, Ontario, Canada. This location disappeared during road-widening in 1986.

Thanks to Reiner Mielke's auction on eBay for the specimen and the images!

Phlogopite

A beautiful micro of bright-red phlogopite on matrix from the San Vito quarry, San Vito, Ercolano, Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy. This phlogopite really does "resemble fire"!

Thanks to Paolo Bracci's auction on eBay for the specimen and the image!

Pimelite

A good thumbnail of pimelite (a hydrated nickel hydroxysilicate clay) from the type locality of Szklary (Glasendorf), Zabkowice, Lower Silesia, Poland. Pimelite's status has changed over the years - a re-validation research project has begun.

Thanks to Helmut Braith's auction on eBay for the specimen!

Row 53

Pinite
after
Cordierite

Pinite's the name given to pseudomorphs of mica and clay group minerals after other silicates, especially cordierite (in this case), nepheline, and scapolite - this miniature's from Timmins, South Porcupine, Ontario, Canada. Pinite inverts to mullite upon heating, thus making it valuable for refractories.

Thanks to Ken Massie's auction on eBay for the specimen!

Polylithionite

This is another one of those busy miniatures from Mont Sainte Hilaire (Poudrette Quarry) - the mineral of interest here is polylithionite, one of the less common lithium-rich biotite micas. There's also astrophyllite, natrolite, catapleiite, aegirine, albite, and microcline present.

Thanks to Tim Jokela, Jr. at Element 51 for the specimen!

Polylithionite

A beautiful miniature polylithionite rosette from Mont Sainte Hilaire, Quebec, Canada. The larger image (closeup) shows an unidentified pair of crystals.

Thanks to Jonathan Levinger's auction on eBay for the specimen and the image!

Row 54

Polylithionite

An excellent miniature of grayish-blue polylithionite from Varuträsk, Skellefteå, Västerbotten, Sweden.

Thanks to Kyle Smith's auction on eBay for the specimen and the images!

Prehnite

Prehnite's a companion of zeolites - this miniature from India also has gyrolite balls and two "cubes" of apophyllite.

Thanks to Dean Johnstone at mineralsfromindia.com for the specimen!

Prehnite on
Laumontite

Very pale green prehnite crystals coat this laumontite miniature from Poona, India.

Row 55

Prehnite

Big green wheels of prehnite (the first mineral to be named after a person) and a datolite crystal comprise this specimen from the classic locality of East Granby, Connecticut.

Thanks to Carl Bentley's auction on eBay for the specimen!

Prehnite

An excellent miniature of green prehnite balls on matrix from the O&G Quarry, Southbury, New Haven County, Connecticut. Ex: William Barrett collection.

Thanks to Graeber & Himes' table at the 2003 Carnegie Gem & Mineral Show for the specimen!

Prehnite

A beautiful thumbnail cluster of sharp prehnite crystals from the Jeffrey Quarry, Asbestos, Québec, Canada.

Thanks to C. Carter Rich's table at the 2003 Carnegie Gem & Mineral Show for the specimen!

Row 56

Prehnite

A very rare orange prehnite cluster from the April 2000 find in a small fissure cavity (measuring only 20 cm wide and 40 cm deep) at the N'Chwaning II Mine, Kalahari manganese fields, Northern Cape Province, South Africa. The orange color is due to managnese and the crystals are atypical for prehnite - they have elongated pyramidal terminations anbd are quite transparent. It has a Scholten's Fine Minerals tag.

Thanks to Marvin Schwalb's auction on eBay for the specimen and the image!

Prehnite

A beautiful miniature of blue prehnite Prospect Park Quarry, Prospect Park, Passaic County, New Jersey. This was one of many prehnite specimens collected by Jim VanderVeer in the late 1970s - in addition to the prehnite, there's veins of dark-green pumpellyite (larger image, center row), calcite, and datolite.

Thanks to Karen VanderVeer's auction on eBay for the specimen and the images!

Prochlorite

One of the chlorite group minerals, prochlorite is considered by some to be clinochlore, but most analyses show less silicon and more ferrous iron. This deep-green foliated massive prochlorite is from Chester, Windsor County, Vermont. Ex: W. Scott Lewis Collection.

Thanks to Vince Olsovsky's auction on eBay for the specimen and the images!

Row 57

Pyrophyllite

A beautiful burgundy-tinted white pyrophyllite.

Pyrophyllite

Most of the time pyrophyllite is in a massive form as a constituent of slate and other metamorphic rocks - this golden cluster is from the Ward Mine, Glendon, Moore County, North Carolina.

Thanks to Clive Knell's auction on eBay for the specimen!

Pyrophyllite

This rust-stained pyrophyllite cluster is from California.

Thanks to Jan Garland's (Fine Rocks) auction on eBay for the specimen!

Row 58

Pyrophyllite

A thumbnail of pyrophyllite on quartzite from (probably Bisbee) Arizona.

Thanks to Denise & Gary's auction on eBay for the specimen!

Pyrophyllite

A colorful miniature of pyrophyllite from the Graves Mountain Mines, Lincoln County, Georgia.

Thanks to Eva Stern's auction on eBay for the specimen and the image!

Pyrophyllite

A very rare green-tinted small cabinet pyrophyllite also from the Graves Mountain Mines.

Thanks to Mike Streeter's auction on eBay for the specimen and the images!

Row 59

Rectorite

An excellent miniature of tan interwoven rectorite (a mixed clay-mica) strips from the Jeffrey Quarry near Jeffrey, Pulaski County, Arkansas. Synthetic rectorite has interesting uses, among them: as a nanocomposite mixed with SBR it becomes an excellent inner tube / tire liner, as a Chitosan-impregnated organic-rectorite (OREC) sponge, it excels at controlling wound infection and bleeding.

Thanks to Kristen Burgess' auction on eBay for the specimen!

Sanbornite
and Gillespite

This type locality miniature from Mariposa County, California, consists primarily of pearly white sanbornite with some red gillespite accents. Both minerals are rare barium (there's only a few barium minerals at all) silicates - gillespite has some iron in it which accounts for the red coloration.

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen!

Saponite

A nice micro of white saponite (a member of the smectite group) on matrix from the Laurium Mine, south of Laurium, Houghton County, Michigan.

Thanks to Chris Stefano's auction on eBay for the specimen and the image!

Row 60

Saponite, var
Nickeloan Saponite

A nice miniature of nickeloan (10.5% Ni) saponite from the highway intersection 1 mile W of Democrat, Buncombe County, North Carolina. The larger image (bottom) shows an additional thumbnail. This material, when stabilized, has also been marketed as garnierite.

Thanks to Anthony Jones' auction on eBay for the specimen!

Saponite, var.
Sobotkite

An excellent miniature of massive pink sobotkite (aluminum-rich saponite) from Cuya, Los Camarones, Arica Province, Chile.

Thanks to Kerry Day's (Kaygeedee Minerals) auction on eBay for the specimen and the image!

Schallerite

Schallerite's a 12-member-ring mica-like phyllosilicate with arsenic in its composition - it's also dimorphous with nelenite (ferroschallerite). This miniature comes from Franklin, New Jersey.

Thanks to Emilie & Ron Kendig's auction on eBay for the specimen!

Row 61

Searlesite

A micromount of searlesite (a sodium hydroxyborosilicate) from the Boron Pit, Kern County, California.

Thanks to Don Smoley's Minerals & Gems' table at the 2002 Carnegie Gem & Mineral Show for the specimen!

Spodiophyllite

An excellent miniature of pinkish spodiophyllite (a mica closely related to tainiolite) plates on an aegirine matrix from its type locality of the Narssârssuk pegmatite, Narssârssuk, Igaliku, Narsaq, Kitaa Province, Greenland. Though discredited by the IMA Mica Subcommittee in 1998, it remains the subject of much discussion. There are at least two formulas for its composition - (Na,K)4(Mg,Fe+2)3(Fe+3,Al)2(Si8O24) is the most prevalent.

Thanks to Jason McAvoy's (Mineralman.com) auction on eBay for the specimen and the images!

Stilpnomelane

This excellent specimen of stilpnomelane (from two Greek words meaning "shining" and "black") on white chert comes from Bellingham, Skagit County, Washington. The large image (second row) shows a second specimen with a heavier coating of stilpnomelane on green and white chert from the same location.

Thanks to Joseph George's (Cascade Scepters) auction on eBay for the specimen!

Row 62

Stilpnomelane

Occasionally stilpnomelane occurs in other colors, like this golden small cabinet specimen from the famous French Creek Mine, St. Peters, Chester County, Pennsylvania.

Thanks to Ron Sloto's auction on eBay for the specimen and the image!

Stilpnomelane,
var. Chalcodite

This miniature of bronze-colored chalcodite (iron-rich stilpnomelane) and hematite on calcite comes from the varietal type locality of the Sterling Mine in Antwerp, Jefferson County, New York.

Thanks to Dan Wienrich at Dan & Jill Weinrich for the specimen and the image!

Stilpnomelane,
var. Ekmanite

A small cabinet specimen of ekmanite (manganoan stilpnomelane) and orange-red fluorescent calcite from the type locality of the Brunsjögruvan (Brunsjö Mine), Grythyttan, Västmanland, Sweden.

Thanks to SoCal Nevada's auction on eBay for the specimen and images!

Row 63

Strigovite

Strigovite's an obscure member of the chlorite group - Fe3(Al,Fe)3Si3O11(OH)7 - it occurs here with pyrite and smoky quartz on an orthoclase matrix from the type locality of the Strzegom-Sobótka Massif, Lower Silesia, Poland. Some references consider strigovite to be thuringite (ferroan chamosite) or an odd habit of chamosite.

Thanks to Mirek Dorejko's auction on eBay for the specimen and the images!

Tainiolite

A miniature with a few grayish-green ribbons of tainiolite (larger image, center) from Imperia Province, Liguria, Italy. Tainiolite is a magnesium potassium lithium member of the biotite series.

Thanks to Ingo Drescher's auction on eBay for the specimen and the image!

Talc

A very nice miniature of light green talc from Chester, Windsor County, Vermont.

Thanks to Tony Nikischer at the Excalibur Mineral Company for the specimen!

Row 64

Talc

Emerald green talc from the Ropes gold mine in Ishpeming, Marquette County, Michigan.

Thanks to Brian McManus at the Pebble Peddler for the specimen!

Tetraferrinontronite

A miniature of brown massive tetraferrinontronite from the Ingichka Mine, Zirabulak Mts, Samarkand Viloyati, Uzbekistan. It came from dealer Tony Jones in May 2010 and has a European-style collection tag. The name has not been approved by the IMA, but an analyzed sample has this formula: Mg0.20Fe3+3.80[(Si6.98Al0.15Fe3+0.87)O20](OH)4Ca0.45Mg0.15Na0.02 and it's related to other nontronite minerals.

Thanks to David H. Garske's auction on eBay for the specimen!

Tetraferriphlogopite

A nice miniature of bronze-green tetraferriphlogopite from the Keivy Mountains, Kola Peninsula, Northern Region, Russia. It's the ferric analog of phlogopite.

Thanks to Robert Vano's auction on eBay for the specimen and the images!

Row 65

Tungusite

An excellent micro of greenish radiating tungusite (a calcium iron hydroxysilicate) on matrix from Newbury Park, Santa Monica Mts, Ventura County, California. It's a member of the gyrolite group.

Thanks to Paolo Bracci's auction on eBay for the specimen and the image!

Tuperssuatsiaite with
Villiaumite

Named for its discovery site in Greenland, tuperssuatsiaite is a member of the mica family. This miniature comes from the Aris Quarry in Windhoek, Namibia. The tuperssuatsiaite appears as golden tufts in the minute vugs (closeups) along with black aegirine needles and submillimeter villaumite cubes (larger image, bottom right).

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen!

Tuperssuatsiaite

A somewhat better miniature from the same locale - the tuperssuatsiaite tuft is much more visible! There's also some unidentified minerals under the tuft (larger image, bottom right).

Thanks to Justin Zzyzx's (ZzyzxMinerals) auction on eBay for the specimen and the images!

Row 66

Vermiculite

A reddish-brown book of vermiculite from Goiás, Brazil. Vermiculite's an alteration product of muscovite - water becomes trapped between the layers. The resulting enormous expansion upon heating makes vermiculite useful for thermal and acoustical insulation.

Thanks to Mike Keim at Marin Minerals for the specimen!

Vermiculite,
var. Jeffersite

This large miniature of bronze-black jeffersite, a variety of vermiculite, comes from the varietal type locality of the Brinton's Quarry, West Chester, Chester County. The closeup shows blue-gray areas of probable delamination. It's named after the famous Chester County collector whose collection forms the core of the Carnegie Museum collection in Pittsburgh. Jeffersite is now considered by most references to be a synonym for vermiculite and not a bronze-colored variety.

Thanks to Ron Sloto's auction on eBay for the specimen!

Vertumnite

An excellent thumbnail of acicular vertumnite sprays on matrix from the Bellerberg volcano area in Ettringen, Eifel, Rhineland-Palatinate, Germany- probably the Caspar quarry. It also occurs as transparent pseudohexagonal plates at the same location. This specimen has an Excalibur Minerals tag.

Thanks to Tom & Vicki Loomis at Dakota Matrix Minerals for the specimen and the image!

Row 67

Vladykinite

An excellent micro of pale pink vladykinite (a complex strontium 4-, 5-, and 8-ring phyllosilicate) aggregates on a feldspar-aegirine matrix from the type locality of Tausonitovaya Gorka, Murun Massif, Aldan Shield, Eastern Siberia, Russia. Vladykinite is structurally similar to the nordite group minerals and is often pseudomorphed by strontianite.

Thanks to Csanad Loranth's auction on eBay for the specimen and the images!

Volkonskoite

A solid thumbnail of volkonskoite, a chromium-containing member of the smectite/montmorillonite group of hydrated hydroxysilicates. It's from the Ural Mountains in Russia, possibly from the type locality of Efimyatskaya Mountain. It's used as a "natural mineral pigment" in high-quality discoloration-resistant paint (also in artists' oil paint - it's said that Picasso imported Russian volkonskoite for his work) and in ceramic glazes.

Thanks to Chris Wong's auction on eBay for the specimen and the image!

Wesselsite
and Sugulite

A pretty miniature of pink sugilite and bright blue wesselsite (a strontium copper tetrasilicate) in a pectolite matrix from the type locality of the Wessels Mine, Hotazel, Kalahari manganese field, Northern Cape Province, South Africa. It's a member of the gillespite group and forms a complete series with effenbergerite where barium replaces some of the copper.

Thanks to John Veevaert at Trinity Minerals for the specimen and the images!

Row 68

Windhoekite

An excellent micro of tiny tan blades of windhoekite (a hydrated iron calcium hydroxysilicate) on matrix from the type (and only) locality of the Aris Quarries, Windhoek District, Khomas Region, Namibia. It's a member of the palygorskite group.

Thanks to Stefano Broetto's auction on eBay for the specimen and the images!

Wonesite

A thumbnail of dark-brown interlocking wonesite plates comprising matrix from the type locality of the Post Pond Volcanics, Mt Cube Quadrangle, Norwich, Windsor County, Vermont. It's one of the many mica group members.

Thanks to Tony Nikischer at the Excalibur Mineral Company for the specimen!

Yofortierite

Beautiful pink yofortierite in matrix from Mont St. Hilaire's famous Poudrette Quarry. There's both massive and crystalline sprays (closeup) here.

Thanks to Emilie & Ron's auction on eBay for the specimen!

Row 69

Zakharovite

Tiny yellow crystals of zakharovite (a hydrated manganese sodium hydroxydecasilicate) on matrix comprise this thumbnail from the Poudrette Quarry, Mont Saint-Hilaire, Monteregie, Quebec.

Thanks to Kristen Burgess' auction on eBay for the specimen!

Zakharovite,
Unnamed Fe-analog

There is also an as-yet-unnamed iron analog of zakharovite where ferrous iron replaces the manganese. This micro of brownish-orange crystals on matrix comes from the type (and only) locality of the Aris Quarries, Aris, Windhoek District, Khomas Region, Namibia.

Thanks to Paolo Bracci's auction on eBay for the specimen and the image!

Zinnwaldite

A very nice miniature of zinnwaldite (a rare member of the mica group) from the type locality of Zinwald, Erzgebirge, Saxony, Germany. Ex: Curt G. Segeler collection.

Thanks to Val Collins' auction on eBay for the specimen and the image!

maintained by: Alan Guisewite

Last Update 11 Aug 2015