Bismutite

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What Wikipedia says

Bismutite or bismuthite is a bismuth carbonate mineral with formula Bi2(CO3)O2 (bismuth subcarbonate). Bismutite occurs as an oxidation product of other bismuth minerals such as bismuthinite and native bismuth in hydrothermal veins and pegmatites.

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

Image: Leon Hupperichs, CC BY-SA 3.0, via Wikimedia Commons.