Pekoite Mineral Data

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General Pekoite Information

Chemical Formula:

PbCuBi11(S,Se)18

Composition:

Molecular Weight = 3,240.51 gm

Copper 1.96 % Cu

Bismuth 70.94 % Bi

Lead 6.39 % Pb

Selenium 4.87 % Se

Sulfur 15.83 % S

______

100.00 %

Empirical Formula:

PbCuBi₁₁S₁₆Se₂

Environment:

In magnetite pipes that cut felsic sediments and pyroclastics.

IMA Status:

Approved IMA 1976

Locality:

Peko mine, Tennant Creek, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for its locality.

Name Pronunciation:

Pekoite

Synonym:

ICSD 60151

PDF 30-488

Pekoite Image

Images:

Pekoite

Comments: Gray-metallic pekoite disseminated in quartz with chalcopyrite.
Location: Falungruva, Dalarna, Sweden. Scale: Not given.
© Diederik Visser

Pekoite Crystallography

Axial Ratios:

a:b:c =0.3399:1:0.119

Cell Dimensions:

a = 11.472, b = 33.744, c = 4.016, Z = 2; V = 1,554.64 Den(Calc)= 6.92

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P 2₁am

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

By Intensity(I/I_o): 3.14(1), 3.025(0.4), 3.622(0.3),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Mumme W G , Watts J A , The Canadian Mineralogist , 14 (1976) p.322-333, Pekoite, CuPbBi11S18, a new member of the bismuthinite-alkinite mineral series:, its crystal structure and relationship with naturally- and synthetically-formed members, Note: x-coordinate of S18 changed in order to generate reported bond lengths.

Physical Properties of Pekoite

Cleavage:

{010} Good

Color:

Lead gray.

Diaphaneity:

Opaque

Hardness:

2-3 - Gypsum-Calcite

Luster:

Metallic

Streak:

lead gray

Optical Properties of Pekoite

Optical Data:

NCalc= 1.94 - from Gladstone-Dale relationship (KC = 0.1353) where Ncalc=Dcalc*KC+1

RL Color:

White to cream.

Calculated Properties of Pekoite

Electron Density:

Bulk Density (Electron Density)=5.76 gm/cc
note: Specific Gravity of Pekoite =6.92 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Pekoite=1,496.26 barns/electron
U=PE_Pekoite x rElectron Density=8,614.28 barns/cc.

Radioactivity:

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

Pekoite Classification

Dana Class:

03.04.05.06 (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 Pekoite Information

References:

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

See Also:

Links to other databases for Pekoite :
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 Pekoite Specimen Label here :

Pekoite

PbCuBi11(S,Se)18
Dana No: 03.04.05.06 Strunz No: 02.HB.05a
Locality:

Notes: