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Selenopolybasite Mineral Data
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General Selenopolybasite Information
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 Chemical Formula: |
[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] |
| Composition: |
Molecular Weight = 2,378.81 gm |
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Zinc 0.03 % Zn |
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Iron 0.07 % Fe |
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Copper 3.21 % Cu |
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Silver 66.52 % Ag |
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Bismuth 0.09 % Bi |
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Antimony 9.52 % Sb |
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Arsenic 0.60 % As |
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Lead 0.09 % Pb |
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Selenium 8.46 % Se |
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Sulfur 11.42 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag5.67Cu0.2Bi0.01Pb0.01Zn0.01Fe2+0.03Sb1.86As0.19S6.68Se0.34Ag9CuS1.79Se0.21Se2 |
| Environment: |
Pearceite-polybasite group |
| IMA Status: |
Approved IMA 2006 (Dana # Added) |
| Locality: |
De Lamar mine, Owyhee County, Idaho, U.S.A. Link to MinDat.org Location Data. |
| Name Origin: |
Named as the selenium dominant analogue of polybasite. |
| Synonym: |
IMA2006-053 |
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Selenopolybasite-Tac |
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Selenopolybasite Crystallography
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| Axial Ratios: |
a:c = 1:1.58961 |
| Cell Dimensions: |
a = 7.595, c = 12.0731, Z = 1; V = 603.12 Den(Calc)= 6.55 |
| Crystal System: |
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: P 3m1 |
| 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), |
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Physical Properties of Selenopolybasite
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| Cleavage: |
None |
| Color: |
Black. |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
3-3.5 - Calcite-Copper Penny |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Selenopolybasite
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| Optical Data: |
NCalc= 1.84 - from Gladstone-Dale relationship (KC = 0.129) where Ncalc=Dcalc*KC+1
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| RL Bireflectance: |
Weak to moderate. |
| RL Color: |
Light gray. |
| RL Pleochroism: |
Weakly gray to violet blue gray. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Selenopolybasite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
29.30 |
34.10 |
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| 547 nm |
30.20 |
32.90 |
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| 580 nm |
31.00 |
31.80 |
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| 650 nm |
32.80 |
30.00 |
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Calculated Relative Intensity Colors of Selenopolybasite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
300% |
| R1 |
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| R2 |
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Calculated Properties of Selenopolybasite
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| Electron Density: |
Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Selenopolybasite =6.55 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0075078228
Boson Index = 0.9924921772 |
| Photoelectric: |
PESelenopolybasite = 215.89 barns/electron
U=PESelenopolybasite x rElectron Density=1,248.80 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Selenopolybasite is Not Radioactive |
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Selenopolybasite Classification
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| Dana Class: |
03.01.07.03 (03)Sulfides - Sulfosalts |
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(03.01)where z/y > 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.01.07)Polybasite group |
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03.01.07.01 Arsenpolybasite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] C 2/m 2/m |
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03.01.07.02 Polybasite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m |
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03.01.07.03 Selenopolybasite! [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] P 3m1 3m |
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03.01.07.04 Cupropolybasite! [Cu6Sb2S7][Ag9CuS4] P 3m1 3 2/m |
| Strunz Class: |
02.GB.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.G - Sulfarsenites, sulfantimonites, sulfbismuthites |
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02.GB -Neso-sulfarsenites, etc |
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02.GB.15 Antimonpearceite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m |
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02.GB.15 Arsenpolybasite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] C 2/m 2/m |
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02.GB.15 Polybasite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m |
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02.GB.15 Pearceite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] P 3m1 3 2/m |
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02.GB.15 Cupropearceite [Cu6As2S7][Ag9CuS4] P 3m1 3 2/m |
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02.GB.15 Selenopolybasite! [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] P 3m1 3m |
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02.GB.15 Cupropolybasite! [Cu6Sb2S7][Ag9CuS4] P 3m1 3 2/m |
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Other Selenopolybasite Information
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| References: |
NAME( AmMin, v93:1689) PHYS. PROP.(AmMin, v93:1689) OPTIC PROP.(AmMin, v93:1689) |
| 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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Selenopolybasite
[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2]
Dana No: 03.01.07.03 Strunz No: 02.GB.15
Locality:
Notes:
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