Mineral Information and Data:

Bismuthinite
Bi2S3 [CNMNC approved formula]

Named from the composition.

IMA status : Valid species (Pre-IMA 1832) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.11.02.03  
  (02) Sulfides - Including Selenides and Tellurides
  (02.11) where Am Bn Xp, with (m+n):p=2:3
  (02.11.02) Stibnite Group (Orthorhombic: Pbnm)
  
Nickel-Strunz
(10th edition) :
02.DB.05a
  (02) Sulfides
  (02.D) Metal Sulfides, M:S = 3:4 and 2:3
  (02.DB) M:S = 2:3
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Space group: Pbnm
Unit cell: a = 11.12Å, b = 11.25Å, c = 3.97Å, Z=4
Crystal Habit: Crystals, up to 12 cm, stout prismatic to acicular, elongated and striated || [001]. Commonly massive with foliated or fibrous texture.
  
Color: Lead-gray to tin-white, with a yellowish or iridescent tarnish
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2 - 2.5
Measured Density: 6.78 g/cm3
Cleavage: {010}, perfect and easy, {100} and {110}, imperfect
Tenacity: Flexible, somewhat sectile
Streak: Lead-gray
  
Polymorphism and Series: Forms a series with stibnite.
Geologic Setting: Typically in low- to high-temperature hydrothermal vein deposits, in tourmaline-bearing copper deposits in granite, in some gold veins formed at high temperatures, and in recent volcanic exhalation deposits.
Mineral Association: Bismuth, aikinite, arsenopyrite, stannite, galena, pyrite, chalcopyrite, tourmaline, wolframite, cassiterite, quartz.
  

 

Bismuthinite
Bismuthinite with quartz
Origin: Yaogangxian Mine, Chenzhou area, Hunan, Central South Region, China
Sample size: 8.7 x 7.2 x 4.6 cm
Photo: Dan Weinrich

 

Bismuthinite
(zoom-in of above)

 

Bismuthinite
Origin: Farellon Viejo mine, Tazna Mountain, Atocha-Quechisla district, Sud-Chichas Province, Potosi Department, Bolivia
Sample size: 6.5 x 4 x 4 cm
Photo: Dan Weinrich

 

Bismuthinite
(zoom-in of above)

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