Mineral Information and Data:

Stibnite
Sb2S3 [CNMNC approved formula]

Named from the Greek "stibi" and Latin "stibium", names for metal antimony.

IMA status : Valid species (Pre-IMA 1832) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.11.02.01  
  (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
Unit cell: a = 11.23 Å, b = 11.31 Å, c = 3.839 Å
Crystal Habit: Crystals slender prismatic, vertically striated often bent or twisted, bladed, columnar, massive, compact
Twinning: Rare on {130}, {120} or perhaps {310}
  
Color: Pale to dark lead-gray, may tarnish iridescent, bluish or blackish
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 2
Measured Density: 4.63 to 4.66 g/cm3
Cleavage: 3; {010} perfect, easy, {100} and {110} imperfect
Tenacity: Highly flexible but not elastic; slightly sectile
Fracture: Sub-conchoidal
Streak: Lead-gray
  
Polymorphism and Series: Dimorphous with metastibnite.
Forms a series with bismuthinite.
Geologic Setting: Of hydrothermal origin, formed in veins through a wide range of temperatures.
Mineral Association: Realgar, orpiment, cinnabar, galena, lead sulfantimonides, pyrite, marcasite, arsenopyrite, cervantite, stibiconite, calcite, ankerite, barite, chalcedonic quartz.
Ore deposits: Primary ore of antimony
  
Synonyms/varieties: Antimonite

 

Stibnite
Origin: Goldstrike mine, Eureka Co., Nevada, USA
Sample size: about 5 x 2 cm, crystals to 2-3 mm
Photo: Tom Loomis

 

Stibnite
(zoom-in of above)

 

Stibnite
Origin: Manhattan, Nye Co., Nevada, United States
Sample size: 5 x 3.5 x 3 cm
Photo: Tom Loomis

 

Stibnite
(zoom-in of above)

 

Stibnite
Origin: McLaughlin mine, Napa Co., California, United States
Sample size: 7 x 6 x 7 cm
Photo: Tom Loomis

 

Stibnite
(zoom-in of above)

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