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Freibergite

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Formula:
Ag6[Cu4Fe2]Sb4S13-x
May also be expressed as (Ag4+2xCu2-2x)[(Cu,Ag)4(Fe,Zn)2]Sb4S12S1-x (0 < x < 1)
Colour:
Grey
Lustre:
Metallic
Hardness:
3½ - 4
Specific Gravity:
5.41 (Calculated)
Crystal System:
Isometric
Name:
After the type locality of Freiberg, Saxony, Germany.
Tetrahedrite Group. Argentotennantite-Freibergite Series, and the Freibergite-Tetrahedrite Series. The Ag-dominant analogue of Tetrahedrite. Varieties with Ag below 4 atoms per formula unit should be called Ag-rich tetrahedrite.

See also the closely related, Ag-rich members argentotetrahedrite and rozhdestvenskayaite.

The accurate status and definition of freibergite are still under discussion, see Moëlo et al. (2008).


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Classification of FreibergiteHide

Approved, 'Grandfathered' (first described prior to 1959)
2.GB.05

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
3.3.6.3

3 : SULFOSALTS
3 : 3 <ø < 4
5.2.15

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
2 : Sulpharsenites etc. of Ag

Physical Properties of FreibergiteHide

Metallic
Transparency:
Opaque
Colour:
Grey
Streak:
Reddish black
Hardness:
3½ - 4 on Mohs scale
Hardness:
VHN100=263 - 340 kg/mm2 - Vickers
Density:
5.41 g/cm3 (Calculated)

Chemical Properties of FreibergiteHide

Formula:
Ag6[Cu4Fe2]Sb4S13-x

May also be expressed as (Ag4+2xCu2-2x)[(Cu,Ag)4(Fe,Zn)2]Sb4S12S1-x (0 < x < 1)
IMA Formula:
Ag6Cu4Fe2Sb4S13-x
Common Impurities:
Zn,Hg,Bi

Crystallography of FreibergiteHide

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
I4 3m
Cell Parameters:
a = 10.56 Å
Unit Cell V:
1,177.58 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tetrahedral crystals, massive

Type Occurrence of FreibergiteHide

Synonyms of FreibergiteHide

Other Language Names for FreibergiteHide

Relationship of Freibergite to other SpeciesHide

Other Members of this group:
ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
ArgentotetrahedriteAg6Cu4(Fe,Zn)2Sb4S13Iso. 4 3m : I4 3m
GirauditeCu6[Cu4(Fe,Zn)2]As4Se13Iso. 4 3m : I4 3m
GoldfielditeCu10Te4S13Iso. 4 3m : I4 3m
HakiteCu6[Cu4Hg2]Sb4Se13Iso. 4 3m : I4 3m
RozhdestvenskayaiteAg10Zn2Sb4S13Iso. 4 3m : I4 3m
TennantiteCu6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13Iso. 4 3m : I4 3m
UM1992-21-S:AgFeSb(Ag,Fe,Zn,Hg)12(Sb,As)4S13Iso.
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz64 photos of Freibergite associated with Quartz on mindat.org.
Siderite29 photos of Freibergite associated with Siderite on mindat.org.
Calcite29 photos of Freibergite associated with Calcite on mindat.org.
Chalcopyrite29 photos of Freibergite associated with Chalcopyrite on mindat.org.
Sphalerite26 photos of Freibergite associated with Sphalerite on mindat.org.
Pyrite14 photos of Freibergite associated with Pyrite on mindat.org.
Dolomite11 photos of Freibergite associated with Dolomite on mindat.org.
Plumosite11 photos of Freibergite associated with Plumosite on mindat.org.
Semseyite4 photos of Freibergite associated with Semseyite on mindat.org.
Pyrrhotite4 photos of Freibergite associated with Pyrrhotite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.GB.05ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
2.GB.05GirauditeCu6[Cu4(Fe,Zn)2]As4Se13Iso. 4 3m : I4 3m
2.GB.05GoldfielditeCu10Te4S13Iso. 4 3m : I4 3m
2.GB.05HakiteCu6[Cu4Hg2]Sb4Se13Iso. 4 3m : I4 3m
2.GB.05TennantiteCu6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
2.GB.05TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13Iso. 4 3m : I4 3m
2.GB.10SelenostephaniteAg5Sb(Se,S)4Orth.
2.GB.10StephaniteAg5SbS4Orth. mm2 : Cmc21
2.GB.15Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
2.GB.15Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
2.GB.15UM2003-14-S:AgBiFeTeAg16FeBiTe3S8
2.GB.15Selenopolybasite[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]Trig. 3m (3 2/m) : P3m1
2.GB.15Cupropearceite[Cu6As2S7][Ag9CuS4]Trig. 3m (3 2/m) : P3m1
2.GB.15Cupropolybasite[Cu6Sb2S7][Ag9CuS4]Trig. 3m : P3 1m
2.GB.15UM1979-17-S:BiCuFe~Cu18Fe4BiS16
2.GB.20Galkhaite(Cs,Tl)(Hg,Cu,Zn)6(As,Sb)4S12Iso. 4 3m : I4 3m

Related Minerals - Dana Grouping (8th Ed.)Hide

3.3.6.1TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13Iso. 4 3m : I4 3m
3.3.6.2TennantiteCu6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
3.3.6.4HakiteCu6[Cu4Hg2]Sb4Se13Iso. 4 3m : I4 3m
3.3.6.5GirauditeCu6[Cu4(Fe,Zn)2]As4Se13Iso. 4 3m : I4 3m
3.3.6.6GoldfielditeCu10Te4S13Iso. 4 3m : I4 3m
3.3.6.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.2.1SmithiteAgAsS2Mon. 2/m
5.2.2TrechmanniteAgAsS2Trig.
5.2.3ProustiteAg3AsS3Trig. 3m (3 2/m) : R3c
5.2.4XanthoconiteAg3AsS3Mon. 2/m : B2/b
5.2.5Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]Trig. 3m (3 2/m) : P3m1
5.2.6Pearceite-T2acTrig. 3 2 : P3 2 1
5.2.7ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13Iso. 4 3m : I4 3m
5.2.8MiargyriteAgSbS2Mon. 2/m : B2/b
5.2.9PyrargyriteAg3SbS3Trig. 3m : R3c
5.2.10PyrostilpniteAg3SbS3Mon.
5.2.11StephaniteAg5SbS4Orth. mm2 : Cmc21
5.2.12Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]Mon. 2/m : B2/m
5.2.13BillingsleyiteAg7AsS6Iso. 2 3 : P21 3
5.2.14Polybasite-TacTrig. 3m (3 2/m) : P3m1
5.2.16AramayoiteAg3Sb2(Bi,Sb)S6Tric. 1 : P1
5.2.17MatilditeAgBiS2Hex.
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4SIso.
5.2.19PavoniteAgBi3S5Mon. 2/m : B2/m
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2Trig. 3m (3 2/m) : P3m1
5.2.22SelenostephaniteAg5Sb(Se,S)4Orth.
5.2.23Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]Trig. 3m (3 2/m) : P3m1
5.2.24VolynskiteAgBiTe2Orth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for FreibergiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, Charles, Harry Berman & Clifford Frondel (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 379.
American Mineralogist (1975): 60: 489.
Paar, W. H., Chen, T. T. & Günther, W. (1978): Extrem silberreicher Freibergit in Pb-Zn-Cu-Erzen des Bergbaues "Knappenstube", Hochtor, Salzburg. Carinthia II, 168./88., 35-42 (in German).
Mineralogicheskii Zhurnal: 15: 9-17.
Sack, R. O.; Lynch, J. V. G.; Foit, F., Jr. (2003): Fahlore as a petrogenetic indicator: Keno Hill Ag-Pb-Zn district, Yukon, Canada. Mineralogical Magazine 67, 1023-1038. [on miscibility gap in Ag-rich Sb-fahlore]
Moëlo, Y., Makovicky, E., Mozgova, N.N., Jambor, J.L., Cook, N., Pring, A., Paar, W., Nickel, E.H., Graeser, S., Karup-Møller, S.; Balić-Žunić, T.; Mumme, W.G., Vurro, F., Topa, D., Bindi, L., Bente, K., Shimizu, M. (2008) Sulfosalt systematics: a review. Report of the sulfosalt sub-committee of the IMA Commission on Ore Mineralogy. European Journal of Mineralogy, 20, 7-46.

Internet Links for FreibergiteHide

Localities for FreibergiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

Mineral and/or Locality  
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