Euchroite

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.

Euchroite
General
Category	Arsenate minerals
Formula	Cu2AsO4OH·3H2O
IMA symbol	Euc[1]
Strunz classification	8.DC.07
Crystal system	Orthorhombic
Crystal class	Disphenoidal (222) H-M symbol: (2 2 2)
Space group	P212121