Mineral Information and Data:

Bornite
Cu5FeS4 [CNMNC approved formula]

Named for Ignaz Born, Austrian mineralogist (1742-1791). Known since 1725, but not given a name until 1845 as erubescite. In 1962, IMA approved the spacies with its current name - bornite.

IMA status : Approved Species 1962 (IMA1962-s.p.)
CLASSIFICATION 
Dana
(8th edition) :
02.05.02.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.05) where Am Bn Xp, with (m+n):p=3:2
  (02.05.02)
  
Nickel-Strunz
(10th edition) :
02.BA.10
  (02) Sulfides
  (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1)
  (02.BA) With Cu, Ag, Au
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 10.94 Ǻ, b = 21.86 Ǻ, c = 10.95 Ǻ
Crystal Habit: Crystals cubic, octahedral or dodecahedral, rare; massive, granular
Twinning: On {111}, penetration
  
Color: Copper-red or bronze, tarnishes iridescent purplish
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 3
Measured Density: 5.079 g/cm3
Cleavage: 1; {111} in traces
Tenacity: Brittle
Fracture: Uneven to subconchoidal
Streak: Light grayish black
  
Geologic Setting: Associated with and disseminated in mafic igneous rocks, in contact metamorphic skarn deposits, in pegmatites, in medium- to high-temperature hydrothermal deposits, and in sedimentary cupriferous shales; stable below ≈200 °C.
Mineral Association: Chalcopyrite, pyrite, other copper and iron sulfides, garnet, calcite, wollastonite,
quartz
  
Synonyms/varieties: Erubescite, peacock ore, phillipsine
Comments: Important copper ore.
It has a copper-red color on fresh exposures which quickly tarnishes to an iridescent purple after exposure to air and moisture. May be confused with tarnished chalcopyrite.

 

Bornite
Origin: Dzhezkazgan, Kazakhstan
Sample size: 3.5 x 2.8 x 1.3 cm
Photo: Rob Lavinsky

 

Bornite

 

Bornite
Origin: Kamoto mine, Kolwezi, Shaba, Dem. Rep. Congo
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Bornite
Origin: Apache mine, Globe, Gila Co., Arizona, U.S.A.
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Bornite
Blue iridescent Bornite as a coating and as massive association with and on leaf silver.
Origin: Mina San Martin, Sombrerete, Zacatecas, Mexico
Sample size: 5 x 5 x 4 cm
Photo: Tom Loomis

 

Bornite
(zoom-in of above)

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