Cu2AsO4OH
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Olivenite — Olivenite, Špania Dolina, Slovakia General Category Arsenate minerals … Wikipedia
Euchroite — is a hydrated copper arsenate hydroxide mineral with formula: Cu2AsO4OH·3H2O. It is a vitreous green to emerald green mineral crystallizing in the orthorhombic system. It has a Mohs hardness of 3.5 4.0 and a specific gravity of 3.39 3.45. It was… … Wikipedia