Tyrolite

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Tyrolite is a hydrous calcium copper arsenate carbonate mineral with the formula CaCu5(AsO4)2CO3(OH)4⋅6H2O. Tyrolite forms glassy, blue to green orthorhombic radial crystals and botryoidal masses. It has a Mohs hardness of 1.5–2.0 and a specific gravity of 3.1–3.2.

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

Image: Auteur inconnu, CC BY 2.0, via Wikimedia Commons.