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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. © John Betts - Fine Minerals
Coalingite: Mg10Fe+++2(CO3)(OH)24·2(H2O)
Comments: Brown micaceous sub-metallic coatings of coalingite on serpentinite rock. Location: Near Gem Mine, San Benito County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cobaltarthurite: CoFe+++2(AsO4)2(OH)2·4(H2O) Arseniosiderite: Ca2Fe+++3(AsO4)3O2·3(H2O)
Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite. Location: Pastrana, Mazarrón, Murcia, Spain. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag
Cobaltaustinite: CaCo(AsO4)(OH)
Comments: Green, tabular crystal of cobaltaustinite. Location: Rappold Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Cobaltite: CoAsS
Comments: Cobaltite embedded in greenish gray dolomite. Location: Espanola, Ontario, Canada. Scale: 1.3 cm across. © John Veevaert
Cobaltkoritnigite: (Co,Zn)(AsO3OH)·(H2O) Erythrite: Co3(AsO4)2·8(H2O)
Comments: Dark purplish cobaltkoritnigite with pink erythrite. Location: Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Cobaltlotharmeyerite: Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2
Comments: Brown crystalline aggregates of cobaltlotharmeyerite on matrix. Location: Sauschwart Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.. © Thomas Witzke / Abraxas-Verlag
Cobaltomenite: CoSeO3·2(H2O)
Comments: Purple micro crystals of cobaltomenite on matrix. Location: Paris #25 mine, Thompson district, Utah, USA. Scale: 2.5 x 2 cm. © John Veevaert
Cobaltpentlandite: Co9S8
Comments: Bronze-yellow cobaltpentlndite in pyrrhotite. Location: Outokumpu, Finland. Scale: Specimen Size 0.8x1.5 cm. © Diederik Visser
Cobalttsumcorite: Pb(Co,Fe)2(AsO4)2(OH,H2O)2
Comments: Brown crystals of cobalttsumcorite. Location: Rappold Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Coccinite: Hg++I2 (?) Sulfur: S8
Comments: Orange-red coccinite on sulfur. Due to the volatility of the mineral at room temperature, the sample is preserved in a closed vial. The photo was made through the vial, therefore the sharpness is reduced. Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Coconinoite: Fe+++2Al2(UO2)2(PO4)4(SO4)(OH)2·18(H2O)
Comments: Dull, putty-colored clay-like mass of coconinoite on a sandstone matrix. Location: Jomas mine, White Canyon, San Juan County, Utah, USA. Scale: Picture size 1.2 cm. © Paul M. Schumacher
Comments: Pale yellow coatings of coconinoite on sandstone. Location: Jomac Mine, White Canyon, San Juan County, Utah. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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. © John Betts - Fine Minerals
Coesite: SiO2
Comments: Fine-grained, massive coesite. Location: Meteor Crater, Canyon Diablo, Coconino County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Coesite inclusion in garnet of eclogite sample (Eur. J. Mineral, 13:567). Location: Ultra high-pressure metamorphic area of the Saidenbach reservoir, Erzgebirge, Germany, where micro-diamond-bearing gneiss occurs. Scale: Scale Bar 50 µm. © Eur. J. Mineral
Coffinite: U(SiO4)1-x(OH)4x
Comments: Black, interstitial coffinite cementing a sub-angular quartzose sandstone. Schumacher Collection. Location: Temple Mountain, San Rafael District (San Rafael Swell), Emery Co., Utah, USA. Scale: Picture size 5 mm. © Paul M. Schumacher
Cohenite: (Fe,Ni,Co)3C
Comments: Bluish gray, metallic iridescent crystals of cohenite on matrix. Location: Kopeisk, Chelyabinsk Oblast', Urals Region, Russia. Scale: 2.3 mm. © Thomas Witzke / Abraxas-Verlag
Cohenite: (Fe,Ni,Co)3C Troilite: FeS Kamacite: alpha-(Fe,Ni) Taenite: gamma-(Fe,Ni)
Comments: Brown masses of troilite, with white cohenite, in kamacite/taenite matrix, in meteorite (polished section). Location: Meteor Crater, Canyon Diablo, Coconino County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Coiraite: (Pb,Sn)12.5As3Sn5FeS28
Comments: Dark grayish, micro-crystalline aggregates of coiraite with sphalerite. Location: Mina Pirquitas, Dep. Rinconada, Province Jujuy, Argentina. Scale: Not Given. © Diederik Visser