Krupkaite Mineral Data

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.

Name Pronunciation:

Krupkaite + Pronunciation

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

Images:

Paarite Krupkaite

Comments: A mosaic of large grains of a low-Cu bismuthinite derivative, decomposed into an intergrowth of paarite (bd42) and krupkaite (bd49).
Location: In quartz veins of the Felbertal scheelite deposit, Salzburg Province, Austria. (CanMin v43:909). Scale: See Image.
© Canadian Mineralogist

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 - Pyramidal H-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),

Physical Properties of Krupkaite

Color:

Dark steel gray, Steel gray.

Diaphaneity:

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:

Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Krupkaite =6.98 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

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

Radioactivity:

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

Krupkaite Classification

Dana Class:

03.04.05.02 (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 Krupkaite Information

References:

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

See Also:

Links to other databases for Krupkaite :
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
15 - WWW-MINCRYST

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

Krupkaite

PbCuBi3S6
Dana No: 03.04.05.02 Strunz No: 02.HB.05a
Locality:

Notes:

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