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 first described in 1823 in Ľubietová, Slovakia.

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