Laurite

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Laurite is an opaque black, metallic ruthenium sulfide mineral with formula: RuS2. It crystallizes in the isometric system. It is in the pyrite structural group. Though it's been found in many localities worldwide, it is extremely rare.

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

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