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Bismuth subcarbonate 2CO3, sometimes written Bi2O2 is a chemical compound of bismuth containing both oxide and carbonate anions. Bismuth is in the +3 oxidation state. Bismuth subcarbonate occurs naturally as the mineral bismutite. Its structure consists of Bi-O layers and CO3 layers and is related to kettnerite, CaBiOF. It is light-sensitive.
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