Cooperite

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Cooperite is a grey mineral consisting of platinum sulfide (PtS), generally in combinations with sulfides of other elements such as palladium and nickel (PdS and NiS). Its general formula is (Pt,Pd,Ni)S. It is a dimorph of braggite.

Excerpt from the Wikipedia article “Cooperite (mineral)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: David Hospital, CC BY-SA 4.0, via Wikimedia Commons.