|
![Mineralogy Database Mineralogy Database](/images/Hedyphane_Crystal.gif) |
Selenopolybasite Mineral Data
|
|
|
General Selenopolybasite Information
|
Chemical Formula: |
[(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] |
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 % |
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 |
|
Selenopolybasite-Tac |
|
Selenopolybasite Crystallography
|
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), |
|
Physical Properties of Selenopolybasite
|
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 |
|
Optical Properties of Selenopolybasite
|
Optical Data: |
NCalc= 1.84 - from Gladstone-Dale relationship (KC = 0.129) where Ncalc=Dcalc*KC+1 |
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 |
![](../images/Reflect_scale_v.gif) |
∑ R1(λ) |
∑ R2(λ) |
470 nm |
29.30 |
34.10 |
![](../images/470nm.BMP)
![](../images/470nm.BMP) |
|
|
547 nm |
30.20 |
32.90 |
![](../images/547nm.BMP)
![](../images/547nm.BMP) |
580 nm |
31.00 |
31.80 |
![](../images/580nm.BMP)
![](../images/580nm.BMP) |
650 nm |
32.80 |
30.00 |
![](../images/650nm.BMP)
![](../images/650nm.BMP) |
Calculated Relative Intensity Colors of Selenopolybasite in Air
Relative Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
300% |
R1 |
|
|
|
|
|
|
|
|
|
|
R2 |
|
|
|
|
|
|
|
|
|
|
|
|
Calculated Properties of Selenopolybasite
|
Electron Density: |
Bulk Density (Electron Density)=5.78 gm/cc note: Specific Gravity of Selenopolybasite =6.55 gm/cc. |
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. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Selenopolybasite is Not Radioactive |
|
Selenopolybasite Classification
|
Dana Class: |
03.01.07.03 (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 |
|
03.01.07.01 Arsenpolybasite [Ag9CuS4][(Ag,Cu)6(As,Sb)2S7] C 2/m 2/m |
|
03.01.07.02 Polybasite [Ag9CuS4][(Ag,Cu)6(Sb,As)2S7] C 2/m 2/m |
|
03.01.07.03 Selenopolybasite! [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] P 3m1 3m |
|
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 |
|
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
|
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
Search for Selenopolybasite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Selenopolybasite :
Ask about Selenopolybasite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
Print or Cut-and-Paste your Selenopolybasite Specimen Label here :
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:
|
|
|
|
|
|
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.