Friedrichite Mineral Data

Friedrichite Mineral Data +

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General Friedrichite Information

Chemical Formula:

Pb5Cu5Bi7S18

Composition:

Molecular Weight = 3,393.78 gm

Copper 9.36 % Cu

Bismuth 43.10 % Bi

Lead 30.53 % Pb

Sulfur 17.01 % S

______

100.00 %

Empirical Formula:

Pb₅Cu₅Bi₇S₁₈

Environment:

As aggregates of granular crystals, in boulders of vein quartz which occur in the scree of a landslip.

IMA Status:

Approved IMA 1978

Locality:

Near the emerald beryl deposit in the "Sedl" region, east of the Haqbachtan, Salzburg, Austria. Link to MinDat.org Location Data.

Name Origin:

For Professor Dr.-Ing O.M. Friedrich, of the Mining University, Leoben, Styria, Austria.

Friedrichite Image

Images:

Click Here for Larger Friedrichite Image

Friedrichite Krupkaite Benjaminite

Comments: Crystals of a mixture of friedrichite, krupkaite, and benjaminite, with quartz crystals.
Location: Estela Mine, Julcani District, Junin, Peru. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Friedrichite Crystallography

Axial Ratios:

a:b:c =2.9047:1:0.3442

Cell Dimensions:

a = 33.84, b = 11.65, c = 4.01, Z = 6; V = 1,580.89 Den(Calc)= 21.39

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pb21m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.161(1), 3.584(1), 3.644(1),

Physical Properties of Friedrichite

Color:

Silver gray.

Density:

6.98

Diaphaniety:

Opaque

Hardness:

4 - Fluorite

Luster:

Metallic

Optical Properties of Friedrichite

RL Anisotrophism:

Strong in oil, distinct in air.

RL Color:

Creamy yellowish white in air, more pinkish in oil.

Calculated Properties of Friedrichite

Electron Density:

r_electron=18.0 gm/cc
note: r_Friedrichite=21.4 gm/cc.

Fermion Index

Fermion Index = 0.06873
Boson Index = 0.93127

Photoelectric:

PE_Friedrichite=1,390.76 barns/electron
U=PE_Friedrichite x r_electron=24964.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Friedrichite is Not Radioactive

Friedrichite Classification

Dana Class:

3.4.5.5 (3)Sulfides - Sulfosalts

(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.4.5)Aikinite Group (Orthorhombic containing Pb, Cu, Bi, & S)

3.4.5.1 Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m

3.4.5.2 Krupkaite PbCuBi3S6 P mc2₁ mm2

3.4.5.3 Gladite PbCuBi5S9 P nma 2/m 2/m 2/m

3.4.5.4 Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m

3.4.5.5 Friedrichite Pb5Cu5Bi7S18 Pb21m mm2

3.4.5.6 Pekoite PbCuBi11(S,Se)18 P 2₁am mm2

3.4.5.7 Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m

3.4.5.8 IMA2000-044! Pb1.6Cu1.6Bi6.4S12 P mc2₁ mm2

Strunz Class:

II/E.30-20 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.30 - Aikinite - Pekoite series

II/E.30-10 Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m

II/E.30-15 Soucekite PbCuBi(S,Se)3 Pn21m mm2

II/E.30-20 Friedrichite Pb5Cu5Bi7S18 Pb21m mm2

II/E.30-25 Emilite! Cu10.7Pb10.7Bi21.3S48 P mc2₁ mm2

II/E.30-30 Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m

II/E.30-40 Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m

II/E.30-50 Krupkaite PbCuBi3S6 P mc2₁ mm2

II/E.30-54 Paarite! Cu1.7Pb1.7Bi6.3S12 Pmcn 2/m 2/m 2/m

II/E.30-60 Gladite PbCuBi5S9 P nma 2/m 2/m 2/m

II/E.30-70 Pekoite PbCuBi11(S,Se)18 P 2₁am mm2

Other Friedrichite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Friedrichite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Friedrichite Specimen Label here :

Friedrichite

Pb5Cu5Bi7S18
Dana No: 3.4.5.5 Strunz No: II/E.30-20
Locality:

Notes: