Bismite

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. It has a Mohs hardness of 4 to 5 and a specific gravity of 8.5 to 9.5, quite high for a nonmetallic mineral.

Bismite
Bismite
General
Category	Oxide minerals
Formula	Bi2O3
IMA symbol	Bis[1]
Strunz classification	4.CB.60
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) (same H-M symbol)
Space group	P21/c
Identification
Color	Grey
Fracture	Uneven
Streak	Grey to black
References	[2]

Bismite is a secondary oxidation zone mineral which forms from primary bismuth minerals.

It was first described from Goldfield, Nevada in 1868, and later from the Schneeberg District, Ore Mountains, Saxony, Germany.

See also

• Bismuth trioxide – details on the chemistry of this substance
• Bismutite
• Bismuthinite
• Bismoclite
• Eulytine