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Selenostephanite Mineral Data
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General Selenostephanite Information
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 Chemical Formula: |
Ag5Sb(Se,S)4 |
| Composition: |
Molecular Weight = 930.04 gm |
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Silver 57.99 % Ag |
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Antimony 13.09 % Sb |
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Selenium 25.47 % Se |
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Sulfur 3.45 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag5SbSe3S |
| Environment: |
In quartz and orthclase-quartz veins with other silver minerals. |
| IMA Status: |
Approved IMA 1985 |
| Locality: |
Unidentified locality in central Chukhotka, Russia Link to MinDat.org Location Data. |
| Name Origin: |
Named for the composition and similarity to stephanite. |
| Name Pronunciation: |
Selenostephanite + Pronunciation  |
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Selenostephanite Crystallography
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| Axial Ratios: |
a:b:c =0.6638:1:0.7533 |
| Cell Dimensions: |
a = 7.86, b = 11.84, c = 8.92, Z = 4; V = 830.12 Den(Calc)= 7.44 |
| Crystal System: |
Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 212121 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.96(1), 2.28(0.9), 2.64(0.9), |
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Physical Properties of Selenostephanite
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| Color: |
Lead gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Luster: |
Metallic |
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Optical Properties of Selenostephanite
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| RL Anisotrophism: |
Brownish gray to gray. |
| RL Color: |
Grayish white with olive tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Selenostephanite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
33.30 |
34.80 |
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| 520 nm |
33.60 |
36.00 |
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| 580 nm |
32.60 |
34.80 |
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| 640 nm |
31.00 |
33.00 |
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| 700 nm |
30.40 |
32.30 |
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Calculated Relative Intensity Colors of Selenostephanite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
280% |
| R1 |
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| R2 |
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Calculated Properties of Selenostephanite
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| Electron Density: |
Bulk Density (Electron Density)=6.46 gm/cc
note: Specific Gravity of Selenostephanite =7.44 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PESelenostephanite = 217.21 barns/electron
U=PESelenostephanite x rElectron Density=1,404.00 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Selenostephanite is Not Radioactive |
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Selenostephanite Classification
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| Dana Class: |
03.02.04.02 (03)Sulfides - Sulfosalts |
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(03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.02.04)Stephanite Series |
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03.02.04.01 Stephanite Ag5SbS4 C mc21 mm2 |
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03.02.04.02 Selenostephanite Ag5Sb(Se,S)4 P 212121 2 2 2 |
| Strunz Class: |
02.GB.10 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.10 Selenostephanite Ag5Sb(Se,S)4 P 212121 2 2 2 |
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02.GB.10 Stephanite Ag5SbS4 C mc21 mm2 |
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Other Selenostephanite 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 Selenostephanite :
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
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Print or Cut-and-Paste your Selenostephanite Specimen Label here :
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Selenostephanite
Ag5Sb(Se,S)4
Dana No: 03.02.04.02 Strunz No: 02.GB.10
Locality:
Notes:
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