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Chalcanthite: CuSO4·5(H2O) Chalcocyanite: CuSO4
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
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) 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)
Comments: Fibrous columnar crystalline chalcanthite. Location: Planet Mine, La Paz County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species