Mineral Information and Data:

Freibergite
Ag6Cu4Fe2Sb4S13 [CNMNC approved formula]

Named for the long-known occurrence of silver-rich tetrahedrite at Freiberg, Germany.

IMA status : Valid species (Pre-IMA 1853) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.03.06.03  
  (03) Sulfides - Sulfosalts
  (03.03) where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.03.06) Tetrahedrite Group (Isometric: I-43m)
  
Nickel-Strunz
(10th edition) :
02.GB.05
  (02) Sulfides
  (02.G) Sulfarsenites, sulfantimonites, sulfbismuthites
  (02.GB) Neso-sulfarsenites, etc. with additional S
  
Crystal system: Cubic System
Point group (H-M): 43m (or 4 3m) — hextetrahedral
Space group: I43m
Unit cell: a = 10.474–10.560 Ǻ, Z=2
Crystal Habit: Tetrahedral crystals, to 3.5 cm; massive and as inclusions in other sulfides.
  
Color: Gray to black
Diaphaneity: Opaque
Measured Density: 5.41 (calculated) g/cm3
  
Polymorphism and Series: Forms a series with tetrahedrite and argentotennantite
Geologic Setting: In hydrothermal deposits.
Mineral Association: A wide variety of sulfides and sulfosalts, as for tetrahedrite.
  

 

Freibergite
Bright silvery colored freibergite
with gray colored galena and brownish wurtzite
Origin: Animas Mine, Atocha-Quechisla District, Sud Chichas Province,
Potosí Department, Bolivia
Sample size: 13.8 x 10.7 x 8.8 cm
Photo: Rob Lavinsky

 

Freibergite
(zoom-in of above)

 

Freibergite
Freibergite on siderite
Origin: Galena Mine, Kellogg, Coeur d'Alene District, Shoshone Co., Idaho, U.S.A.
Sample size: 3 x 2.5 x 0.7 cm
Photo: Dan Weinrich

 

Freibergite
(zoom-in of above)

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