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Calderite: (Mn++,Ca)3(Fe+++,Al)2(SiO4)3
Comments: Dark red brown translucent crystalline calderite. Location: Hazaribag, Bihar, India. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Calderonite: Pb2Fe+++(VO4)2(OH)
Comments: Secondary electron image showing a cluster of prismatic calderonite crystals. (AmMin, 88:1704). Location: Santa Marta, Badajoz province, Spain. Scale: See Image. © American Mineralogist
Caledonite: Pb5Cu2(CO3)(SO4)3(OH)6
Comments: Transparent, blue caledonite crystals. Location: Mammoth mine, Tiger, Pinal County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Callaghanite: Cu2Mg2(CO3)(OH)6·2(H2O)
Comments: Blue crystals of callaghanite on matrix. Location: Gabbs, Nevada, USA. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Calomel: Hg2Cl2
Comments: A grayish aggregate of calomel on a rufous matrix. Location: Landsberg (Moschellandsberg), Obermoschel, Palatinate, Rhineland-Palatinate, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Calumetite: Cu(OH,Cl)2·2(H2O)
Comments: Light blue botryoidal coatings of calumetite on tarnished copper with green paratacamite. Location: Centennial Mine, Houghton County, Michigan, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Calvertite: Cu5Ge0.5S4
Comments: SEM images of massive-granular calvertite. The texture is made apparent by the presence of a thin rind of chalcocite (white) on the calvertite grains. (CanMin, v45:1519). Location: Partly oxidized specimen from the Tsumeb mine, Tsumeb, Namibia. Scale: See Image. © Canadian Mineralogist
Calzirtite: CaZr3TiO9 Augite: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 Richterite: Na(CaNa)(Mg,Fe++)5[Si8O22](OH)2
Comments: Gray irregular grain of calzirtite (see arrow) in fibrous augite with dark red richterite. Location: Jacupiranga Mine, Cajati, Sao Paulo, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Camerolaite: Cu4Al2[HSbO4,SO4](OH)10(CO3)·2(H2O)
Comments: Blue spherical aggregates of camerolaite on matrix. Location: Lubietová (Libethen), Banská Bystrica (Neusohl), Banskobystricky Kraj, Slovak Republic. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Cameronite: AgCu7Te10 Rickardite: Cu7Te5 Vulcanite: CuTe
Comments: Gray metallic massive cameronite showing subconchoidal fracture associated with purple rickardite and bronzy plates of vulcanite in a mass of tellurium, co-type specimen. Location: Good Hope mine, Vulcan District, Gunnison County, Colorado, USA. Scale: See Image. © Rruff Database