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Daily Crystal: Freibergite

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  • Aussie Talie
    Daily Crystal: Freibergite http://www.mineralatlas.com/mineral%20photos/F/freibergitecp.htm Freibergite    This specimen of quartz and calcite has several
    Message 1 of 1 , Mar 7, 2013
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      Daily Crystal: Freibergite

      This specimen of quartz and calcite has several scattered, lustrous crystal groups and isolates of freibergite. The largest is 0.5 cm across.
      Origin: San Genare Mine, Huancavelica, Peru
      Sample size: 5.5 x 4.2 x 2.3 cm
      Photo courtesy of: 
      John Veevaert, Trinity Mineral Co
      Freibergite with quartz and siderite
      Origin: Sunshine mine, Kellogg, Idaho, U.S.A.
      Sample size: 2.5 x 2.2 x 3.8 cm
      Photo courtesy of: 
      Dan Weinrich
      Dealer in fine mineral specimens
      Freibergite crystals with siderite in matrix
      Origin: Obecnice, Pribram, Czech Republic
      Sample size: 3 x 4 cm
      Photo courtesy of: 
      Diederik Visser
      Diederik Visser Minerals & Petrological Services

      Dull grey tetragonal crystals to 1mm on dull grey bournonite(?) matrix.
      Origin: Herja Mine, Baia Mare, Maramures Co., Romania
      Ex. Polak collection
      Sample size: 4.5 x 3 x 2 cm
      Photo courtesy of: 
      Tom Loomis
      Dakota Matrix Minerals



      A handsome small cabinet specimen of silvery-black freibergite (a silver copper iron sulfosalt) with azurite in a quartz-andesite breccia from (probably) the Cerro Colorado Mine, Pima County, Arizona. It forms two series; one with argentotennantite and one with tetrahedrite.
      Thanks to Roger McCaslin's auction on eBay for the specimen and the image!


      Freibergite: Freibergite and Owyheeite produces a forceful effect for healing.


      From Wikipedia, the free encyclopedia
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      CategorySulfosalt minerals
      (repeating unit)Cu12Sb4S13
      Strunz classification02.GB.05
      Formula mass1,929.46 gm
      ColorSteel gray to Black
      Crystal habitmassive to well formed crystals
      Crystal systemCubic
      Mohs scale hardness3½ - 4
      Streakreddish black
      Freibergite is a complex sulfosalt mineral of silver, copper, iron, antimony and arsenic with formula (Ag,Cu,Fe)12(Sb,As)4S13. It has cubic crystals and is formed in hydrothermal deposits. It forms one solid solution series with tetrahedrite and another with argentotennantite. Freibergite is an opaque, metallic steel grey to black and leaves a reddish black streak. It has a Mohs hardness of 3.5 to 4.0 and a specific gravity of 4.85 - 5. It is typically massive to granular in habit with no cleavage and an irregular fracture.
      The mineral was first described in 1853 from an occurrence in the silver mines of the type locality at Freiberg, Saxony.
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      is named after the type locality of Freiberg, Saxony, Germany.
      Discovered in 1853;   IMAstatus: Valid (pre-IMA; Grandfathered)
      Chemical Formula: (Ag,Cu, Fe)12(Sb, As)4S13
        Silver Copper Iron Antimony Sulfide
      Molecular Weight: 1929.46 gm
      Composition: Iron 3.47 % Fe    
        Copper 11.86 % Cu    
        Silver 40.25 % Ag

        Antimony 18.93 % Sb

        Arsenic 3.88 % As

        Sulfur 21.60 % S

          100.00 %   100.00 % = TOTAL OXIDE
      Mineral Classification: Sulfides
      Strunz 8th Ed. ID:
      Nickel-Strunz 10th Ed. ID:
        2 : SULFIDES and SULFOSALTS (sulfides, selenides,
      tellurides; arsenides, antimonides, bismuthides; sulfarsenites,
      sulfantimonites, sulfbismuthites, etc.)
      G : Sulfarsenites, sulfantimonites, sulfbismuthites
      B : Neso-sulfarsenites, etc. with additional S
      Related to: Tetrahedrite Group. Argentotennanite-Freibergite Series. Freibergite-Tetrahedrite Series. The Ag-dominant analogue of Tetrahedrite.
      Varieties: None
      Synonyms: Aphtonite, Leukargyrite, Weisgylden
      Crystal Data    
      Isometric - Hextetrahedral
      Crystal Habit:
      Tetrahedral crystals, to 3.5 cm; massive and as inclusions in other sulfides.
      Physical Properties    
      Cleavage: None
      Fracture: Irregular/Uneven
      Moh's Hardness: 3.5 - 4.0; VHN100=263 - 340 kg/mm2
      4.85 - 5.41 (g/cm3)
      Not Radioactive
      Optical Properties    
      Color: Gray, Steel Gray, Black
      Transparency: Opaque
      Luster: Metallic
      Refractive Index: R: (400) 34.1, (420) 34.0, (440) 33.9, (460) 33.7, (480) 33.6, (500) 33.5, (520) 33.3, (540) 33.1, (560) 32.7, (580) 32.2, (600) 31.5, (620) 31.0, (640) 30.4, (660) 30.0, (680) 29.5, (700) 29.0
      Birefringence: 0.00 (opaque)
      Pleochroism: None
      Geological Setting: In hydrothermal deposits.
      Common Associations: A wide variety of sulfides and sulfosalts, as for tetrahedrite.
      Common Impurities: Zn, Hg, Bi
      Type Locality: Reiche Zeche Mine, Himmelfahrt Mine, Freiberg, Freiberg District, Erzgebirge, Saxony, Germany
      Year Discovered: 1853
      View mineral photos: Freibergite Mineral Photos and Locations
      More Information    

      is a complex sulfide mineral consisting of silver, copper,
      iron, antimony and arsenic. It forms a solid solution
      series with Tetrahedrite and another with Argentotennantite.
      Freibergite is opaque black with a metallic luster that
      makes for very attractive gems.
      Freibergite is found at a number of localities worldwide. In Germany, in Saxony, from the Freiberg district [TL], as in the Himmelsfürst mine, Erbisdorf, near Freiberg. From Kutná Hora and the Zlate Hore district, Czech Republic. In Austria, from the Knappenstube mine, Hochtor, Salzburg. From Yukhondzha, Sakha, Russia. At Slädekärr and in the Vena mines, near Askersund, Örebro, Sweden. From the Bleikvassli Zn–Pb–Cu deposit, Nordland, Norway. In Scotland, at Tyndrum, Perthshire. In the Hi-Ho mine, Cobalt-Gowganda region, Ontario; and the Keno Hill-Galena Hill area, Yukon Territory, Canada. Large crystals from the San José mine, Oruro, Bolivia. In Japan, in the Inakuraishi, Koryu, and Sanru mines, Hokkaido. In Australia, at Mt. Isa and the Cannington Ag–Pb–Zn deposit, Queensland; and in the Meerschaum mine, north of Omeo, Victoria. Additional localities are known.

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