Euchroite

euchroite

strashimirite

azurite

olivenite

Images
Formula: Cu₂(AsO₄)(OH).3H₂O
Hydrated arsenate containing hydroxyl
Specific gravity: 3.44
Hardness: 3½ to 4
Streak:
Colour: Bright emerald-green, leek-green; bright bluish green in transmitted light
Solubility: Soluble in acids
Environments:

Hydrothermal environments

Euchroite is a very rare secondary copper arsenate in the oxidised zone of some copper-bearing hydrothermal deposits; it may be pseudomorphed by olivenite (Mindat, HOM).

Localities

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).

Alteration

euchroite (s) to olivenite (s) and H₂O (l)
Cu₂AsO₄(OH). 3H₂O ⇌ Cu₂AsO₄(OH) + 3H₂O
(MM 52.684)

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