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Clinotyrolite: Ca2Cu9[(As,S)O4]4(OH)10·10(H2O) Azurite: Cu3(CO3)2(OH)2
Comments: Light blue acicular crystals of clinotyrolite on dark blue azurite. Location: Lovelock mine, Churchill County, Nevada, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Clinozoisite: Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Comments: Brown, prismatic crystal of clinozoisite. Location: Alchuri, Shigar Skardu district, Pakistan. Scale: Crystal size 7x2.3x1.2 cm. © Fabre Minerals
Comments: Light pink stellate crystal cluster of clinozoisite. Location: Sunnyside mine, Silverton District, San Juan County, Colorado, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Clinozoisite-(Sr): CaSrAl3(Si2O7)(SiO4)O(OH)
Comments: Boulder consisting of prehenite, diaspore, chlorite and niigataite. The pale lavender is prehenite/diaspore and the very pale green is chlorite/niigataite.. Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Specimen size 19cm x 16 cm. © American Mineralogist
Comments: Backscatter electronic image of niigataite (bright) which is partially replacing a chlorite (med gray) grain in a diaspore (dark gray, rod-shaped) and prehenite (light gray) matrix. Location: Itoigawa, river Kazuo, Niigata prefecture, Japan. Scale: Picture size 5 mm. © American Mineralogist
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