Roselite

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Roselite is a rare arsenate mineral with chemical formula: Ca2(Co,Mg)[AsO4]2·H2O. It was first described in 1825 for an occurrence in the Rappold mines of Schneeberg, Saxony, Germany and named by Armand Lévy after German mineralogist Gustav Rose.

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

Image: Christian Rewitzer, CC BY-SA 3.0, via Wikimedia Commons.