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Bismutite
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<p>Bismutite or bismuthite is a <a href="/facts/Bismuth/75FLjkoX">bismuth</a> <a href="/facts/Carbonate_mineral/8DUmuAhp">carbonate mineral</a> with formula Bi2(CO3)O2 (<a href="/facts/Bismuth_subcarbonate/YP1xTc3o">bismuth subcarbonate</a>). Bismutite occurs as an oxidation product of other bismuth minerals such as <a href="/facts/Bismuthinite/mE6cB8UE">bismuthinite</a> and native bismuth in <a href="/facts/Hydrothermal/hqwwksSm">hydrothermal</a> <a href="/facts/Vein_(geology)/TyETstxF">veins</a> and <a href="/facts/Pegmatite/qW5BUXPg">pegmatites</a>. It crystallizes in the <a href="/facts/Orthorhombic/3zo4F8P0">orthorhombic</a> system and typically occurs as earthy to fibrous masses. </p><p>It was first described in 1841 for an occurrence in <a href="/facts/Saxony/PrKscwCP">Saxony</a>. </p><p>The term bismuthite has been used in the past for bismuthinite. </p>