Mineral Information and Data:

Bournonite
CuPbSbS3 [CNMNC approved formula]

Named for Count Jacques Louis de Bournon, French crystallographer and mineralogist (1751-1825).

IMA status : Valid species (Pre-IMA 1805) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.04.03.02  
  (03) Sulfides - Sulfosalts
  (03.04) where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.04.03) Seligmannite Group
  
Nickel-Strunz
(10th edition) :
02.GA.50
  (02) Sulfides
  (02.G) Sulfarsenites, sulfantimonites, sulfbismuthites
  (02.GA) Neso-sulfarsenites, etc. without additional S
  
Crystal system: Orthorhombic System
Point group (H-M): mm2 — pyramidal
Unit cell: a = 8.168 Ǻ, b = 8.712 Ǻ, c = 7.811 Ǻ
Crystal Habit: Crystals short prismatic or tabular; massive, granular
Twinning: Very common on {110}, repeated, cruciform, or cogwheel aggregates
  
Color: Steel-gray to iron-black
Diaphaneity: Opaque
Luster: Brilliant to dull
Hardness (Mohs): 2.5 to 3
Measured Density: 5.83 g/cm3
Cleavage: 3; {010} imperfect, {100} and {001} less perfect
Tenacity: Brittle
Fracture: Subconchoidal to uneven
Streak: Steel-gray to iron-black
  
Polymorphism and Series: Series with seligmannite.
Geologic Setting: In hydrothermal veins formed at medium temperatures.
Mineral Association: Galena, tetrahedrite, sphalerite, chalcopyrite, pyrite, stibnite, zinkenite, siderite,
quartz, rhodochrosite, dolomite, barite
  
Synonyms/varieties: Cog-wheel-ore, endellionite

 

Bournonite
Origin: Rodna Veche, Romania
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Bournonite
Origin: Yaogangxian Mine, Chenzhou, Hunan Province, China
Sample size: 4 x 4 x 1.5 cm
Photo: Rob Lavinsky

 

Bournonite
Origin: Yaogangxian Mine, Chenzhou, Hunan Province, China
Sample size: 4 x 4 x 1.5 cm
Photo: Rob Lavinsky

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