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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
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
Corkite: PbFe+++3(PO4)(SO4)(OH)6 Hinsdalite: (Pb,Sr)Al3(PO4)(SO4)(OH)6
Comments: Small brown rounded translucent crystals of corkite on darker brown botryoidal hinsdalite. Location: Grube Schone Aussicht, near Dernbach, Montabaur, Rheinland-Pflaz, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Cornubite: Cu5(AsO4)2(OH)4 Conichalcite: CaCu(AsO4)(OH)
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
Corrensite: (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O)
Comments: White earthy crust of corrensite on matrix. Location: Bolet, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species