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Clinochalcomenite: CuSeO3·2(H2O) Kerstenite: PbSeO4 (?) Krutaite: CuSe2
Comments: Tan opaque fibrous kerstenite with possible blue clinochalcomenite on dark krutaite. Location: Mina El Dragon, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinoenstatite: Mg2Si2O6
Comments: Crystalline massive clinoenstatite. Location: Cape Vogel, Papua New Guinea. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinoferrosilite: (Fe++,Mg)2Si2O6
Comments: Light green crystalline clinoferrosilite with dark green diopside. Location: Bushveld Complex, Merensky Reef, Rustenberg, Northern Province, South Africa. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinoholmquistite: [ ](Li2Mg3Al2)Si8O22(OH)2 Magnesioclinoholmquistite: Li2(Mg,Fe++)3Al2Si8O22(OH)2 Fluoro-sodic-pedrizite: NaLi2(Mg2Al2Li)?5Si8O22F2
Comments: Dark blue fibrous clinoholmquistite with radiating structure, variety magnesioclinoholmquistite. Clinoholmsquitite may be a new aphibole, fluoro-sodic-pedrizite.. Location: Near Murun, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinohumite: (Mg,Fe++)9(SiO4)4(F,OH)2
Comments: Orange-brown glassy crystalline clinohumite. Location: Kuhi-Lal, Pamir, Gorno-Badahsan, Tadzhikistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinojimthompsonite: (Mg,Fe++)5Si6O16(OH)2 Jimthompsonite: (Mg,Fe++)5Si6O16(OH)2
Comments: Pale green to white glassy crystalline fibrous clinojimthompsonite intergrown with jimthompsonite. Location: Chester, Windsor County, Vermont, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinosafflorite: (Co,Fe,Ni)As2
Comments: Silvery metallic granular clinosafflorite in rock. Location: Nordmark, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Clinotobermorite: Ca5Si6(O,OH)18·5(H2O)
Comments: Opaque white pure massive clinotobermorite. Location: Bazhenovskoe, Asbest, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Coconinoite: Fe+++2Al2(UO2)2(PO4)4(SO4)(OH)2·18(H2O)
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
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
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
Columbite-(Fe): Fe++Nb2O6 Baotite: Ba4(Ti,Nb)8Si4O28Cl
Comments: Minute brown crystalline grains of baotite in dark ferrocolumbite (columbite-(Fe)). Location: Sheep Creek, Ravalli County, Montana. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Columbite-(Fe): Fe++Nb2O6 Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)
Comments: Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)). Location: Holdazan, Buregteg, Mongolia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Columbite-(Fe): Fe++Nb2O6 Upalite: Al(UO2)3(PO4)2O(OH)·7(H2O)
Comments: Thin translucent yellowish upalite crusts on a prismatic, black columbite crystal. Location: Thin translucent yellowish crusts on undifferntiated columbite crystal. Scale: Picture Size 2 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Combeite: Na2Ca2Si3O9
Comments: Crystalline cleavage fragment of combeite. Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Congolite: (Fe++,Mg,Mn)3B7O13Cl
Comments: Pearly crystalline grains of congolite. Location: Brazzaville, Pool, Congo. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Conichalcite: CaCu(AsO4)(OH) Cornubite: Cu5(AsO4)2(OH)4
Comments: Blue green crystalline cornubite alteration of enargite with green conichalcite in white calcite. Location: Lime Bluff Quarry, Lycoming County, Pennsylvania, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Copiapite: Fe++Fe+++4(SO4)6(OH)2·20(H2O) Rozenite: Fe++SO4·4(H2O) Ferrinatrite: Na3Fe+++(SO4)3·3(H2O)
Comments: White powdery rozenite coating with yellow ferrinatrite on purple copiapite. Location: Le Cetine Mine, Siena, Tuscany, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Coquimbite: Fe+++2(SO4)3·9(H2O) Goldichite: KFe+++(SO4)2·4(H2O) Ferricopiapite: Fe+++2/3Fe+++4(SO4)6(OH)2·20(H2O)
Comments: Prismatic to fibrous crystals of goldichite on white massive coquimbite with yellow ferricopiapite. Location: Dexter No. 7 Mine, Calf Mesa, San Rafael Swell, Emery County, Utah, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species