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Fedotovite: K2Cu++3(SO4)3O Dolerophanite: Cu2(SO4)O Chalcanthite: CuSO4·5(H2O)
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
Fedotovite: K2Cu++3(SO4)3O Chalcanthite: CuSO4·5(H2O)
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