Algodonite

Rarity: Common

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What Wikipedia says

Algodonite is a copper arsenide mineral with formula: Cu6As. It is a gray white metallic mineral crystallizing in the hexagonal system. It has a Mohs hardness of 4 and a specific gravity of 8.38 – 8.72.

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

Image: Ra'ike (see also: de:Benutzer:Ra'ike), CC BY-SA 3.0, via Wikimedia Commons.