Pekoite Mineral Data

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.

Synonym:

ICSD 60151

PDF 30-488

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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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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.

Diaphaniety:

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:

r_electron=5.76 gm/cc
note: r_Pekoite=6.92 gm/cc.

Fermion Index

Fermion Index = 0.01902
Boson Index = 0.98098

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pekoite is Not Radioactive

Pekoite Classification

Dana Class:

3.4.5.6 (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.30-70 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 Pekoite Information

References:

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

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Pekoite

PbCuBi11(S,Se)18
Dana No: 3.4.5.6 Strunz No: II/E.30-70
Locality:

Notes: