Mineralogy Database

Skippenite Mineral Data

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General Skippenite Information

Help on Chemical  Formula: Chemical Formula: Bi2Se2(Te,S)
Help on Composition: Composition: Molecular Weight = 679.60 gm
   Bismuth    61.50 %  Bi
   Tellurium  14.08 %  Te
   Selenium   23.24 %  Se
   Sulfur      1.18 %  S
             100.00 % 
Help on Empirical Formula: Empirical Formula: Bi2Se2Te0.75S0.25
Help on Environment: Environment: In a vein-type uranium deposit with other tellurides and selenides.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Otish Mountains Uranium deposit, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George Skippen, Carleton University, Ottawa, Canada.
Help on Name Pronunciation: Name Pronunciation: Skippenite + Pronunciation Say SKIPPENITE
Help on Synonym: Synonym: ICSD 42544
  PDF 42-1373

Skippenite Image

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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

Skippenite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:6.96151
Help on Cell Dimensions: Cell Dimensions: a = 4.183, c = 29.12, Z = 3; V = 441.26 Den(Calc)= 7.67
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.074(1), 2.09(0.8), 2.267(0.7),

Physical Properties of Skippenite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Steel gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Skippenite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, blue to bluish gray.
Help on RL Color: RL Color: White with a yellow tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Skippenite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 420 nm   41.00   43.00 
 440 nm   44.60   46.10 
 460 nm   46.50   47.80 
 480 nm   47.70   48.80 
 500 nm   48.30   49.50 
 520 nm   48.70   50.00 
 540 nm   49.00   50.30 
 560 nm   49.10   50.40 
 580 nm   49.10   50.40 
 600 nm   49.20   50.50 
 620 nm   49.30   50.60 
 640 nm   49.40   50.80 
 660 nm   49.40   50.80 
 680 nm   49.40   50.80 
 700 nm   49.40   50.80 
Calculated Relative Intensity Colors of Skippenite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 200%

Calculated Properties of Skippenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.25 gm/cc
note: Specific Gravity of Skippenite =7.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESkippenite =1,287.16 barns/electron
U=PESkippenite x rElectron Density=8,047.96 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Skippenite is Not Radioactive

Skippenite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.11)where Am Bn Xp, with (m+n):p=2:3
  (02.11.07)Tetradymite Group (Trigonal: R-3m) Tetradymite Bi2Te2S R 3m 3 2/m Tellurobismuthite Bi2Te3 R 3m 3 2/m Tellurantimony Sb2Te3 R 3m 3 2/m Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m Skippenite Bi2Se2(Te,S) R 3m 3 2/m Vihorlatite! Bi24Se17Te4 P 3m1 3 2/m
Help on  Strunz Class: Strunz Class: 02.DC.05c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.D - Metal Sulfides, M:S = 3:4 and 2:3
  02.DC -Variable M:S
02.DC.05c Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m
02.DC.05c Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m
02.DC.05c Skippenite Bi2Se2(Te,S) R 3m 3 2/m
02.DC.05c Tetradymite Bi2Te2S R 3m 3 2/m
02.DC.05c Tellurantimony Sb2Te3 R 3m 3 2/m
02.DC.05c Tellurobismuthite Bi2Te3 R 3m 3 2/m

Other Skippenite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Am.Min.,Vol.74,p947,1989) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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

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Dana No: Strunz No: 02.DC.05c





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