Bismite
Compounds
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Bismite is a bismuth oxide mineral, bismuth trioxide or Bi₂O₃. It is a monoclinic mineral, but the typical form of occurrence is massive and clay-like with no macroscopic crystals. The color varies from green to yellow. Wikipedia
IMA symbol: Bis
Color: Grey
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal system: Monoclinic
Formula (repeating unit): Bi2O3