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 Veins are blood vessels in humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated b ...

and

pegmatite A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than and sometimes greater than . Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic com ...

s.Mindat
/ref> It crystallizes in the

orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a r ...

system and typically occurs as earthy to fibrous masses.Webmineral
/ref> It was first described in 1841 for an occurrence in Saxony. The term bismuthite has been used in the past for bismuthinite.

References

Carbonate minerals Bismuth minerals Orthorhombic minerals Minerals in space group 71 {{carbonate-mineral-stub