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Chalcanthite: CuSO4·5(H2O) Fedotovite: K2Cu++3(SO4)3O
Comments: Green fedotovite with pale blue chalcanthite. Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Chalcanthite: CuSO4·5(H2O) Dolerophanite: Cu2(SO4)O Fedotovite: K2Cu++3(SO4)3O
Comments: Brown crystals of dolerophanite with blue chalcanthite and green fedotovite. Location: Great Fissure (Main Fracture) eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Chalcanthite: CuSO4·5(H2O)
Comments: Fibrous columnar crystalline chalcanthite. Location: Planet Mine, La Paz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chalcoalumite: CuAl4(SO4)(OH)12·3(H2O)
Comments: Pale bluish stellate twins of chalcoalumite on matrix. Location: Lavender Pit, Bisbee, Cohchise County, Arizona, USA. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Chalcocite: Cu2S
Comments: Chalcocite crystals in this specimen vary in size up to 1.2 cm across. Location: Bristol nr. Hartford, Connecticut, USA. Scale: 7.6 x 4 cm. © John Veevaert
Chalcocite: Cu2S Eskolaite: Cr2O3
Comments: Green crystalline eskolaite on massive chalcocite. Location: Lubelin, Poland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chalcocyanite: CuSO4 Chalcanthite: CuSO4·5(H2O)
Comments: White to pale bluish chalcocyanite with darker bluish chalcanthite. The mineral is hygroscopic and must be stored in a closed box. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Chalcomenite: CuSeO3·2(H2O)
Comments: Blue crystals of chalcomenite on matrix. Location: El Dragón mine, Quijarro province, Potosí, Bolivia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Chalconatronite: Na2Cu(CO3)2·3(H2O)
Comments: Crystalline crusts of blue chalconatronite on sandstone. Location: Slick Rock, Egnar Area, San Miguel County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Chalconatronite: Na2Cu(CO3)2·3(H2O) Sanromanite: Na2CaPb3(CO3)5 Juangodoyite: Na2Cu(CO3)2
Comments: Yellowish, long balded sanromanite crystals in vug with platy, blue juangodoyite replacing green chalconatronite. Location: Santa Rosa mine, Iquique Province, Tarapaca, Chile. Scale: Picture size 3 mm. © Tom Loomis / Dakota Matrix