Mineralogy Database

Pekoite Mineral Data

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General Pekoite Information

Help on Chemical  Formula: Chemical Formula: PbCuBi11(S,Se)18
Help on Composition: 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 % 
Help on Empirical Formula: Empirical Formula: PbCuBi11S16Se2
Help on Environment: Environment: In magnetite pipes that cut felsic sediments and pyroclastics.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Peko mine, Tennant Creek, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its locality.
Help on Name Pronunciation: Name Pronunciation: Pekoite Say PEKOITE
Help on Synonym: Synonym: ICSD 60151
  PDF 30-488
 

Pekoite Image

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  Pekoite

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

Pekoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3399:1:0.119
Help on Cell Dimensions: Cell Dimensions: a = 11.472, b = 33.744, c = 4.016, Z = 2; V = 1,554.64 Den(Calc)= 6.92
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P 21am
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.14(1), 3.025(0.4), 3.622(0.3),
 

Physical Properties of Pekoite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Lead gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: lead gray
 

Optical Properties of Pekoite

Help on Optical Data: Optical Data: NCalc= 1.94 - from Gladstone-Dale relationship (KC = 0.1353) where Ncalc=Dcalc*KC+1
Help on RL Color: RL Color: White to cream.
 

Calculated Properties of Pekoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.76 gm/cc
note: Specific Gravity of Pekoite =6.92 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPekoite =1,496.26 barns/electron
U=PEPekoite x rElectron Density=8,614.28 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pekoite is Not Radioactive
 

Pekoite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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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Pekoite

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

 

Notes:

 

 
   
 


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