Euchroite

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Euchroite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Robert M. Lavinsky, CC BY-SA 3.0, via Wikimedia Commons.