Kutnohorite

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Kutnohorite is a rare calcium manganese carbonate mineral with the formula CaMn2+(CO3)2 in the dolomite group of minerals. It forms a solid solution with the other group members dolomite and ankerite. The mineral was originally spelt "kutnahorite", but "kutnohorite" is the current IMA-approved spelling.

Excerpt from the Wikipedia article “Kutnohorite”, 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.