Mineralogy Database

Selenopolybasite Mineral Data

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General Selenopolybasite Information

Help on Chemical  Formula: Chemical Formula: [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]
Help on Composition: Composition: Molecular Weight = 2,378.81 gm
   Zinc       0.03 %  Zn
   Iron       0.07 %  Fe
   Copper     3.21 %  Cu
   Silver    66.52 %  Ag
   Bismuth    0.09 %  Bi
   Antimony   9.52 %  Sb
   Arsenic    0.60 %  As
   Lead       0.09 %  Pb
   Selenium   8.46 %  Se
   Sulfur    11.42 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ag5.67Cu0.2Bi0.01Pb0.01Zn0.01Fe2+0.03Sb1.86As0.19S6.68Se0.34Ag9CuS1.79Se0.21Se2
Help on Environment: Environment: Pearceite-polybasite group
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: De Lamar mine, Owyhee County, Idaho, U.S.A. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the selenium dominant analogue of polybasite.
Help on Synonym: Synonym: IMA2006-053

Selenopolybasite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.58961
Help on Cell Dimensions: Cell Dimensions: a = 7.595, c = 12.0731, Z = 1; V = 603.12 Den(Calc)= 6.55
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.888(1), 3.0183(0.84), 2.888(0.48),3.1731(0.48), 2.3629(0.34), 1.8987(0.31), 2.2237(0.28), 2.5466(0.23),

Physical Properties of Selenopolybasite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Selenopolybasite

Help on Optical Data: Optical Data: NCalc= 1.84 - from Gladstone-Dale relationship (KC = 0.129) where Ncalc=Dcalc*KC+1
Help on RL Bireflectance: RL Bireflectance: Weak to moderate.
Help on RL Color: RL Color: Light gray.
Help on RL Pleochroism: RL Pleochroism: Weakly gray to violet blue gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Selenopolybasite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   29.30   34.10 
 547 nm   30.20   32.90 
 580 nm   31.00   31.80 
 650 nm   32.80   30.00 
Calculated Relative Intensity Colors of Selenopolybasite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 300%

Calculated Properties of Selenopolybasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Selenopolybasite =6.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0075078228
Boson Index = 0.9924921772
Help on Photoelectric: Photoelectric: PESelenopolybasite = 215.89 barns/electron
U=PESelenopolybasite x rElectron Density=1,248.80 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Selenopolybasite is Not Radioactive

Selenopolybasite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.01.07)Polybasite group Arsenpolybasite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] C 2/m 2/m Polybasite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m Selenopolybasite! [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] P 3m1 3m Cupropolybasite! [Cu6Sb2S7][Ag9CuS4] P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 02.GB.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GB -Neso-sulfarsenites, etc
02.GB.15 Antimonpearceite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m
02.GB.15 Arsenpolybasite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] C 2/m 2/m
02.GB.15 Polybasite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m
02.GB.15 Pearceite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] P 3m1 3 2/m
02.GB.15 Cupropearceite [Cu6As2S7][Ag9CuS4] P 3m1 3 2/m
02.GB.15 Selenopolybasite! [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] P 3m1 3m
02.GB.15 Cupropolybasite! [Cu6Sb2S7][Ag9CuS4] P 3m1 3 2/m

Other Selenopolybasite Information

Help on References: References: NAME( AmMin, v93:1689) PHYS. PROP.(AmMin, v93:1689) OPTIC PROP.(AmMin, v93:1689)
Help on See Also: See Also: Links to other databases for Selenopolybasite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 02.GB.15





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