Arsenolite

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

Arsenolite is an arsenic mineral, with chemical formula As2O3. It is formed as an oxidation product of arsenic sulfides. Commonly found as small octahedra, it is white, but impurities of realgar or orpiment may give it a pink or yellow hue.

Excerpt from the Wikipedia article “Arsenolite”, 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.