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Chrysotile: Mg3Si2O5(OH)4

Comments: Polished slab of chrysotile asbestos minerals showing the fibrous, chatoyant crystal patterns.
Location: Globe, Globe-Miami District, Gila Co., Arizona, USA. Scale: 8x7x1 cm.
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Clintonite: Ca(Mg,Al)3(Al3Si)O10(OH)2

Comments: Several interconnected platy crystals of black clintonite variety xanthophyllite on vuggy matrix.
Location: Green Monster Mountain, Prince of Wales Island, Prince of Wales-Outer Ketchikan Co., Alaska, USA. Scale: 4x3x2 cm.
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Coeruleolactite: (Ca,Cu)Al6(PO4)4(OH)8·4-5(H2O)

Comments: Hexagonal green crystal of coeruleolactite with brownish surface coating.
Location: Turquoise Mine, Cripple Creek, Cripple Creek District, Teller Co., Colorado, USA. Scale: 12x5x4 mm.
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Coloradoite: HgTe

Comments: Massive, metallic coloradoite.
Location: Kalgoorlie, Western Australia, Australia. Scale: 5x2.5x1.5 cm.
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Cookeite: LiAl4(Si3Al)O10(OH)8

Comments: Large tan-colored cookeite epimorph after a large 12 cm quartz crystal. The outer faces of the epimorph are overgrown with milky quartz crystals up to 15 mm long.
Location: Bennett & Orchard Pit mines, Buckfield, Oxford Co., Maine, USA. Scale: 17x17x11 cm.
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Cordierite: Mg2Al4Si5O18

Comments: Brown rectangular cordierite crystals in matrix. These crystals are not gemmy enough to be called iolite.
Location: Richmond Soapstone Quarry, Richmond, Cheshire Co., New Hampshire, USA. Scale: 24x20x15 mm.
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Corundum: Al2O3

Comments: Bright red ruby corundum crystals in white marble matrix.
Location: Jagdalak (Jagdalek; Jagdalik) Ruby Mine, Sorobi District, Konar (Kunar; Konarh; Konarha; Nuristan) Province, Afghanistan. Scale: 4x3.5x3 cm.
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Crandallite: CaAl3(PO4)2(OH)5·(H2O)  
Wardite: NaAl3(PO4)2(OH)4·2(H2O)

Comments: Sliced and polished slab of yellow to white mixture of wardite and crandallite.
Location: Clay Canyon, Fairfield, Utah Co., Utah, USA. Scale: 11x6x.6 cm.
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Diamond: C

Comments: Translucent diamond penetration twin crystals.
Location: Mbuji-Mayi (Miba), Democratic Republic of the Congo (Zaire). Scale: 3.70 carats, 7x7x7 mm.
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Dravite: NaMg3Al6(BO3)3Si6O18(OH)4

Comments: Greenish-brown chrome-rich dravite tourmaline crystals up to 13 mm long with complex terminations. Fluoresces mildly under UV illumination.
Location: Shako Ranch, Mwatate Kabanga, Voi, Taita-Taveta district, Coast Province, Kenya. Scale: 14x13x10 mm.
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Ekanite: ThCa2Si8O20

Comments: Complex specimen of many minerals, most notable are four red ekanite crystals (rare!) scattered around the specimen.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: 6x4x4 cm.
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Epistilbite: CaAl2Si6O16·5(H2O)  
Quartz: SiO2

Comments: White epistilbite cluster 25 mm across on amethyst quartz crystal matrix.
Location: Sawda, Jalgaon, Maharashtra, India. Scale: 10x8x5 cm.
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Eudialyte: Na4(Ca,Ce)2(Fe++,Mn,Y)ZrSi8O22(OH,Cl)2 (?)  
Vlasovite: Na2ZrSi4O11

Comments: Transparent yellow-gray vlasovite crystal frozen in pink eudialyte matrix.
Location: Kipawa alkaline complex, near Sheffield Lake, Villedieu Township, Témiscamingue Co., Québec, Canada. Scale: 2x2x1 cm.
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Fergusonite-(Y): YNbO4

Comments: Heavy mass of fergusonite-(Y) with one face polished flat to show the solid interior. Radioactive.
Location: Ambatofotsy, Betafo - Antsirabé region, Antananarivo Province, Madagascar. Scale: 6x2.5x1.5 cm.
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Ferristrunzite: Fe+++Fe+++2(PO4)2(OH)3·5(H2O)

Comments: Radiating yellow crystals of ferristrunzite on black matrix.
Location: Blaton, Hainaut (Henegouwen; Hennegau) Province, Belgium. Scale: 35x25x15 mm.
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Ferro-edenite: NaCa2Fe++5Si7AlO22(OH)2  
Wohlerite: NaCa2(Zr,Nb)Si2O7(O,OH,F)2

Comments: Transparent yellow wöhlerite crystals embedded in pink feldspar and black mica matrix with black ferro-edenite (var. barkevikite).
Location: Langesundsfjorden, Sandoya Island, Porsgrunn, Norway. Scale: Specimen Size: 5x5x3.5 cm.
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Ferronordite-(Ce): Na3SrCeFe++Si6O17

Comments: Translucent platy pale-brown ferronordite-(Ce) crystals in translucent ussingite.
Location: Karnasurt Mountain, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Russia. Scale: Sample Size 12x10x7 mm..
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Fersmanite: Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3

Comments: Large single crystal of brown fersmanite in quartz matrix.
Location: Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 4x3x2 cm.
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Fluorcanasite: K3Na3Ca5Si12O30F4·H2O

Comments: Small fragment of translucent green fluorcanasite.
Location: Mt. Kukisvumchorr, Khibiny massif, Kola Peninsula, Russia. Scale: Specimen Size 8 x 5 x 2 mm.
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Fluororichterite: Na(CaNa)Mg5[Si8O22]F2

Comments: Doubly-terminated, stubby, black fluororichterite crystal.
Location: Wilberforce, Monmouth Township, Haliburton Co., Ontario, Canada. Scale: 22x21x15 mm.
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