Hydrated arsenate containing hydroxyl
Specific gravity: 3.44
Hardness: 3½ to 4
Colour: Bright emerald-green, leek-green; bright bluish green in transmitted light
Solubility: Soluble in acids
Euchroite is a very rare secondary copper arsenate
in the oxidised zone of some copper-bearing
hydrothermal deposits; it may be pseudomorphed by
At the Zapachitsa deposit, Bulgaria, euchroite is associated with strashimirite, olivenite, azurite and malachite (HOM).
At the type locality, the Svätodušná deposit, Banská Bystrica Region, Slovakia, euchroite occurs as crystals lining crevices in mica schist, associated with olivenite (Mindat, Dana).
euchroite (s) to olivenite (s) and H2O (l)
Cu2AsO4(OH). 3H2O ⇌ Cu2AsO4(OH) + 3H2O
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