Krupkaite Mineral Data

Krupkaite Mineral Data +

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General Krupkaite Information

Chemical Formula:

PbCuBi3S6

Composition:

Molecular Weight = 1,090.08 gm

Copper 5.83 % Cu

Bismuth 57.51 % Bi

Lead 19.01 % Pb

Sulfur 17.65 % S

______

100.00 %

Empirical Formula:

PbCuBi₃S₆

Environment:

In a vein between gneiss and an orthoclase pegmatite intergrown with bismuthinite.

IMA Status:

Approved IMA 1974

Locality:

Krupka, Srredocesky kraj, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 30776

PDF 30-490

Krupkaite Image

Images:

Krupkaite Friedrichite 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

Images:

Krupkaite

Comments: Acicular, fine metallic crystal sprays of krupkaite to 4mm with pale yellow manganoan siderite.
Location: Julcani district, Peru. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Krupkaite Crystallography

Axial Ratios:

a:b:c =0.3574:1:1.0321

Cell Dimensions:

a = 4.003, b = 11.2, c = 11.56, Z = 2; V = 518.28 Den(Calc)= 6.98

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P mc2₁

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

By Intensity(I/I_o): 3.137(1), 2.841(0.37), 3.645(0.3),

Crystal Structure:

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Mumme W G , American Mineralogist , 60 (1975) p.300-308, The crystal structure of krupkaite, CuPbBi3S6, from the Juno Mine at Tennant, Creek, Northern Territory, Australia

View Additional jPOWD Structure files for Krupkaite
[1] [2] [3] [4]

Physical Properties of Krupkaite

Color:

Dark steel gray, Steel gray.

Diaphaniety:

Opaque

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

4 - Fluorite

Luster:

Metallic

Streak:

black

Optical Properties of Krupkaite

RL Color:

Grayish white.

Calculated Properties of Krupkaite

Electron Density:

r_electron=5.84 gm/cc
note: r_Krupkaite=6.98 gm/cc.

Fermion Index

Fermion Index = 0.04333
Boson Index = 0.95667

Photoelectric:

PE_Krupkaite=1,459.07 barns/electron
U=PE_Krupkaite x r_electron=8,520.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Krupkaite is Not Radioactive

Krupkaite Classification

Dana Class:

3.4.5.2 (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.30-50 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 Krupkaite Information

References:

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

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

Krupkaite

PbCuBi3S6
Dana No: 3.4.5.2 Strunz No: II/E.30-50
Locality:

Notes: