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Dolerophanite: Cu2(SO4)O Chalcanthite: CuSO4·5(H2O) 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