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Pekoite Mineral Data
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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. |
| Name Pronunciation: |
Pekoite  |
| Synonym: |
ICSD 60151 |
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PDF 30-488 |
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Pekoite Image |
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Images:
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Pekoite
Comments: Gray-metallic pekoite disseminated in quartz with chalcopyrite.
Location: Falungruva, Dalarna, Sweden.
Scale: Not given.
© Diederik Visser |
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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 - Pyramidal H-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), |
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Physical Properties of Pekoite
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| Cleavage: |
{010} Good |
| Color: |
Lead gray. |
| Diaphaneity: |
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
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| RL Color: |
White to cream. |
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Calculated Properties of Pekoite
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| Electron Density: |
Bulk Density (Electron Density)=5.76 gm/cc
note: Specific Gravity of Pekoite =6.92 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEPekoite =1,496.26 barns/electron
U=PEPekoite x rElectron Density=8,614.28 barns/cc.
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| 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: |
03.04.05.06 (03)Sulfides - Sulfosalts |
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(03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.04.05)Aikinite Group (Orthorhombic containing Pb, Cu, Bi, & S) |
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03.04.05.01 Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m |
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03.04.05.02 Krupkaite PbCuBi3S6 P mc21 mm2 |
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03.04.05.03 Gladite PbCuBi5S9 P nma 2/m 2/m 2/m |
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03.04.05.04 Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m |
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03.04.05.05 Friedrichite Pb5Cu5Bi7S18 Pb21m mm2 |
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03.04.05.06 Pekoite PbCuBi11(S,Se)18 P 21am mm2 |
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03.04.05.07 Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m |
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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 |
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02.H - Sulfosalts of SnS Archetype |
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02.HB -With Cu, Ag, Hg, Fe, Sn and Pb |
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02.HB.05a Aikinite PbCuBiS3 Pbnm 2/m 2/m 2/m |
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02.HB.05a Hammarite Pb2Cu2Bi4S9(?) Pbnm 2/m 2/m 2/m |
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02.HB.05a Gladite PbCuBi5S9 P nma 2/m 2/m 2/m |
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02.HB.05a Friedrichite Pb5Cu5Bi7S18 Pb21m mm2 |
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02.HB.05a Lindstromite Pb3Cu3Bi7S15 Pbnm 2/m 2/m 2/m |
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02.HB.05a Krupkaite PbCuBi3S6 P mc21 mm2 |
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02.HB.05a Pekoite PbCuBi11(S,Se)18 P 21am mm2 |
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02.HB.05a Paarite! Cu1.7Pb1.7Bi6.3S12 Pmcn 2/m 2/m 2/m |
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02.HB.05a Emilite! Cu2.68Pb2.68Bi5.32S12 P mc21 mm2 |
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02.HB.05a Salzburgite! Cu1.6Pb1.6Bi6.4S12 P mc21 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 - 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 :
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Pekoite
PbCuBi11(S,Se)18
Dana No: 03.04.05.06 Strunz No: 02.HB.05a
Locality:
Notes:
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