Spherocobaltite

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What Wikipedia says

Spherocobaltite or sphaerocobaltite is the mineral form of Cobalt(II) carbonate (CoCO3). It is a cobalt bearing member of the calcite group of carbonate minerals, crystallizing in the trigonal crystal system.

Excerpt from the Wikipedia article “Spherocobaltite”, 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.