General Pekoite Information
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Chemical Formula: |
PbCuBi11(S,Se)18 |
Composition: |
Molecular Weight = 3,240.51 gm |
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Copper 1.96 % Cu |
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Bismuth 70.94 % Bi |
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Lead 6.39 % Pb |
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Selenium 4.87 % Se |
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Sulfur 15.83 % S |
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______ |
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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 |
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PDF 30-488 |
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Images:
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Pekoite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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.
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Physical Properties of Pekoite
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Cleavage: |
[010] Good |
Color: |
Lead gray. |
Diaphaniety: |
Opaque |
Hardness: |
2-3 - Gypsum-Calcite |
Luster: |
Metallic |
Streak: |
lead gray |
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Optical Properties of Pekoite
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Optical Data: |
NCalc= 1.94 - from Gladstone-Dale relationship (KC = 0.1353) where Ncalc=Dcalc*KC+1 |
RL Color: |
White to cream. |
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Calculated Properties of Pekoite
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Electron Density: |
relectron=5.76 gm/cc note: rPekoite =6.92 gm/cc. |
Fermion Index |
Fermion Index = 0.01902 Boson Index = 0.98098 |
Photoelectric: |
PEPekoite =1,496.26 barns/electron U=PEPekoite x relectron=8,614.28 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pekoite is Not Radioactive |
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Pekoite Classification
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Dana Class: |
3.4.5.6 (3)Sulfides - Sulfosalts |
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(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(3.4.5)Aikinite Group (Orthorhombic containing Pb, Cu, Bi, & S) |
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3.4.5.1 Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m |
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3.4.5.2 Krupkaite PbCuBi3S6 P mc21 mm2 |
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3.4.5.3 Gladite PbCuBi5S9 P nma 2/m 2/m 2/m |
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3.4.5.4 Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m |
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3.4.5.5 Friedrichite Pb5Cu5Bi7S18 Pb21m mm2 |
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3.4.5.6 Pekoite PbCuBi11(S,Se)18 P 21am mm2 |
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3.4.5.7 Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m |
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3.4.5.8 IMA2000-044! Pb1.6Cu1.6Bi6.4S12 P mc21 mm2 |
Strunz Class: |
II/E.30-70 II - Sulfides and sulphosalts |
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II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6 |
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II/E.30 - Aikinite - Pekoite series |
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II/E.30-10 Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m |
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II/E.30-15 Soucekite PbCuBi(S,Se)3 Pn21m mm2 |
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II/E.30-20 Friedrichite Pb5Cu5Bi7S18 Pb21m mm2 |
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II/E.30-25 Emilite! Cu10.7Pb10.7Bi21.3S48 P mc21 mm2 |
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II/E.30-30 Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m |
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II/E.30-40 Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m |
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II/E.30-50 Krupkaite PbCuBi3S6 P mc21 mm2 |
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II/E.30-54 Paarite! Cu1.7Pb1.7Bi6.3S12 Pmcn 2/m 2/m 2/m |
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II/E.30-60 Gladite PbCuBi5S9 P nma 2/m 2/m 2/m |
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II/E.30-70 Pekoite PbCuBi11(S,Se)18 P 21am mm2 |
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Other Pekoite Information
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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 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Pekoite Specimen Label here :
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Pekoite
PbCuBi11(S,Se)18
Dana No: 3.4.5.6 Strunz No: II/E.30-70
Locality:
Notes:
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