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.

Name Pronunciation:

Friedrichite + Pronunciation

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

Diaphaneity:

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:

Bulk Density (Electron Density)=18.0 gm/cc
note: Specific Gravity of Friedrichite =21.4 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Friedrichite is Not Radioactive

Friedrichite Classification

Dana Class:

03.04.05.05 (03)Sulfides - Sulfosalts

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

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

03.04.05.01 Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m

03.04.05.02 Krupkaite PbCuBi3S6 P mc2₁ mm2

03.04.05.03 Gladite PbCuBi5S9 P nma 2/m 2/m 2/m

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

03.04.05.05 Friedrichite Pb5Cu5Bi7S18 Pb21m mm2

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

03.04.05.07 Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m

03.04.05.08 Salzburgite! Cu1.6Pb1.6Bi6.4S12 P mc2₁ mm2

Strunz Class:

02.HB.05a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HB -With Cu, Ag, Hg, Fe, Sn and Pb

02.HB.05a Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m

02.HB.05a Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m

02.HB.05a Gladite PbCuBi5S9 P nma 2/m 2/m 2/m

02.HB.05a Friedrichite Pb5Cu5Bi7S18 Pb21m mm2

02.HB.05a Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m

02.HB.05a Krupkaite PbCuBi3S6 P mc2₁ mm2

02.HB.05a Pekoite PbCuBi11(S,Se)18 P 2₁am mm2

02.HB.05a Paarite! Cu1.7Pb1.7Bi6.3S12 Pmcn 2/m 2/m 2/m

02.HB.05a Emilite! Cu2.68Pb2.68Bi5.32S12 P mc2₁ mm2

02.HB.05a Salzburgite! Cu1.6Pb1.6Bi6.4S12 P mc2₁ 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Friedrichite here :
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Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Friedrichite Specimen Label here :

Friedrichite

Pb5Cu5Bi7S18
Dana No: 03.04.05.05 Strunz No: 02.HB.05a
Locality:

Notes: