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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