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Skippenite Mineral Data
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General Skippenite Information
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 Chemical Formula: |
Bi2Se2(Te,S) |
| Composition: |
Molecular Weight = 679.60 gm |
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Bismuth 61.50 % Bi |
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Tellurium 14.08 % Te |
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Selenium 23.24 % Se |
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Sulfur 1.18 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Bi2Se2Te0.75S0.25 |
| Environment: |
In a vein-type uranium deposit with other tellurides and selenides. |
| IMA Status: |
Approved IMA 1987 |
| Locality: |
Otish Mountains Uranium deposit, Quebec, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for George Skippen, Carleton University, Ottawa, Canada. |
| Name Pronunciation: |
Skippenite + Pronunciation  |
| Synonym: |
ICSD 42544 |
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IMA1986-033 |
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PDF 42-1373 |
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Skippenite Image |
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Images:
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Skippenite
Comments: SEM image of skippenite (s) crystal containing an inclusion of Bi2(Se,Te,S)2 (a) Bi 2(Se,S)2 (b) associated with clausthalite and chalcopyrite penetrates along watkinsonite (w) grain boundaries.
Location: U vein-typed eposits locatedi n the Otish Mountains basin (Quebec), Canada. (CanMin, v25:625).
Scale: Scale Bar 40 µm.
© Canadian Mineralogist |
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Skippenite Crystallography
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| Axial Ratios: |
a:c = 1:6.96151 |
| Cell Dimensions: |
a = 4.183, c = 29.12, Z = 3; V = 441.26 Den(Calc)= 7.67 |
| Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.074(1), 2.09(0.8), 2.267(0.7), |
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Physical Properties of Skippenite
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| Cleavage: |
{0001} Perfect |
| Color: |
Steel gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Skippenite
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| RL Anisotrophism: |
Moderate, blue to bluish gray. |
| RL Color: |
White with a yellow tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Skippenite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
41.00 |
43.00 |
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| 440 nm |
44.60 |
46.10 |
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| 460 nm |
46.50 |
47.80 |
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| 480 nm |
47.70 |
48.80 |
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| 500 nm |
48.30 |
49.50 |
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| 520 nm |
48.70 |
50.00 |
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| 540 nm |
49.00 |
50.30 |
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| 560 nm |
49.10 |
50.40 |
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| 580 nm |
49.10 |
50.40 |
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| 600 nm |
49.20 |
50.50 |
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| 620 nm |
49.30 |
50.60 |
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| 640 nm |
49.40 |
50.80 |
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| 660 nm |
49.40 |
50.80 |
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| 680 nm |
49.40 |
50.80 |
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| 700 nm |
49.40 |
50.80 |
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Calculated Relative Intensity Colors of Skippenite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
200% |
| R1 |
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| R2 |
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Calculated Properties of Skippenite
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| Electron Density: |
Bulk Density (Electron Density)=6.25 gm/cc
note: Specific Gravity of Skippenite =7.67 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PESkippenite =1,287.16 barns/electron
U=PESkippenite x rElectron Density=8,047.96 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Skippenite is Not Radioactive |
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Skippenite Classification
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| Dana Class: |
02.11.07.06 (02)Sulfides - Including Selenides and Tellurides |
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(02.11)where Am Bn Xp, with (m+n):p=2:3 |
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(02.11.07)Tetradymite Group (Trigonal: R-3m) |
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02.11.07.01 Tetradymite Bi2Te2S R 3m 3 2/m |
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02.11.07.02 Tellurobismuthite Bi2Te3 R 3m 3 2/m |
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02.11.07.03 Tellurantimony Sb2Te3 R 3m 3 2/m |
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02.11.07.04 Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m |
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02.11.07.05 Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m |
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02.11.07.06 Skippenite Bi2Se2(Te,S) R 3m 3 2/m |
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02.11.07.07 Vihorlatite! Bi24Se17Te4 P 3m1 3 2/m |
| Strunz Class: |
02.DC.05c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.D - Metal Sulfides, M:S = 3:4 and 2:3 |
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02.DC -Variable M:S |
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02.DC.05c Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m |
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02.DC.05c Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m |
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02.DC.05c Skippenite Bi2Se2(Te,S) R 3m 3 2/m |
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02.DC.05c Tetradymite Bi2Te2S R 3m 3 2/m |
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02.DC.05c Tellurantimony Sb2Te3 R 3m 3 2/m |
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02.DC.05c Tellurobismuthite Bi2Te3 R 3m 3 2/m |
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Other Skippenite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Am.Min.,Vol.74,p947,1989) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Skippenite :
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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Print or Cut-and-Paste your Skippenite Specimen Label here :
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Skippenite
Bi2Se2(Te,S)
Dana No: 02.11.07.06 Strunz No: 02.DC.05c
Locality:
Notes:
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