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Freibergite

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Formula:
Ag6Cu4Fe2Sb4S13-x
System:
Isometric
Colour:
Grey
Lustre:
Metallic
Hardness:
3½ - 4
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.

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


Classification of Freibergite

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 Freibergite

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

Chemical Properties of Freibergite

IMA Formula:
Ag6Cu4Fe2Sb4S13-x
Mindat.org Formula:
Ag6[Cu4Fe2]Sb4S13-x

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

Crystallography of Freibergite

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

Occurrences of Freibergite

Type Occurrence of Freibergite

Relationship of Freibergite to other Species

Series:
Forms a series with Argentotennantite (see here)
Forms a series with Tetrahedrite (see here)
Other Members of Group:
ArgentotennantiteAg6[Cu4(Fe,Zn)2]As4S13
ArgentotetrahedriteAg6 Cu4(Fe,Zn)2Sb4S13
GirauditeCu6[Cu4(Fe,Zn)2]As4Se13
GoldfielditeCu10Te4S13
HakiteCu6[Cu4Hg2]Sb4Se13
TennantiteCu6[Cu4(Fe,Zn)2]As4S13
TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
2.GB.05ArgentotennantiteAg6Cu4(Fe,Zn)2As4S13
2.GB.05GirauditeCu6[Cu4(Fe,Zn)2]As4Se13
2.GB.05GoldfielditeCu10Te4S13
2.GB.05HakiteCu10Hg2Sb4Se13
2.GB.05TennantiteCu12As4S13
2.GB.05TetrahedriteCu12Sb4S13
2.GB.10SelenostephaniteAg5Sb(Se,S)4
2.GB.10StephaniteAg5SbS4
2.GB.15Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
2.GB.15PolybasiteCu(Ag,Cu)6Ag9Sb2S11
2.GB.15UM2003-14-S:AgBiFeTeAg16FeBiTe3S8
2.GB.15SelenopolybasiteCu(Ag,Cu)6Ag9Sb2(S,Se)9Se2
2.GB.15Cupropearceite[Cu6As2S7][Ag9CuS4]
2.GB.15Cupropolybasite[Cu6Sb2S7][Ag9CuS4]
2.GB.15UM1979-17-S:BiCuFe~Cu18Fe4BiS16
2.GB.20Galkhaite(Hg5Cu)CsAs4S12
5.2.1SmithiteAgAsS2
5.2.2TrechmanniteAgAsS2
5.2.3ProustiteAg3AsS3
5.2.4XanthoconiteAg3AsS3
5.2.5Pearceite[Ag9CuS4][(Ag,Cu)6(As,Sb)2S7]
5.2.6Pearceite-T2ac
5.2.7ArgentotennantiteAg6Cu4(Fe,Zn)2As4S13
5.2.8MiargyriteAgSbS2
5.2.9PyrargyriteAg3SbS3
5.2.10PyrostilpniteAg3SbS3
5.2.11StephaniteAg5SbS4
5.2.12PolybasiteCu(Ag,Cu)6Ag9Sb2S11
5.2.13BillingsleyiteAg7AsS6
5.2.14Polybasite-Tac
5.2.16AramayoiteAg3Sb2(Bi,Sb)S6
5.2.17MatilditeAgBiS2
5.2.18SchapbachiteAg0.4Pb0.2Bi0.4S
5.2.19PavoniteAgBi3S5
5.2.20ArcubisiteAg6CuBiS4
5.2.21BohdanowicziteAgBiSe2
5.2.22SelenostephaniteAg5Sb(Se,S)4
5.2.23BenleonarditeAg15Cu(Sb,As)2S7Te4
5.2.24VolynskiteAgBiTe2

Other Names for Freibergite

Other Information

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 Freibergite

Reference List:
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.

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 Freibergite

mindat.org URL:
https://www.mindat.org/min-1605.html
Please feel free to link to this page.

Localities for Freibergite

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.
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