Mineralogy Database

Tetradymite Mineral Data

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General Tetradymite Information

Help on Chemical  Formula: Chemical Formula: Bi2Te2S
Help on Composition: Composition: Molecular Weight = 705.23 gm
   Bismuth    59.27 %  Bi
   Tellurium  36.19 %  Te
   Sulfur      4.55 %  S
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: Bi2Te2S
Help on Environment: Environment: Found in hydrotherma quartz-gold veins o f moderate to high temperature and contact metamorphic deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1831
Help on Locality: Locality: Zupkov (Zsubko, Schubkau), Stredoslovensk� Kraj, Slovak Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, tetradymos, "fourfold."
Help on Name Pronunciation: Name Pronunciation: Tetradymite + Pronunciation Say TETRADYMITE
Help on Synonym: Synonym: Csiklovaite
  ICSD 26720
  PDF 42-1447
 

Tetradymite Image

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  Tetradymite

Comments: Gray metallic foliated tetradymite in quartz.
Location: Mangfallberg, Boliden, Vasterbotten, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tetradymite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:6.98166
Help on Cell Dimensions: Cell Dimensions: a = 4.2381, c = 29.589, Z = 3; V = 460.26 Den(Calc)= 7.63
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): 2.292(1), 3.1(1), 2.111(0.75),
Help on Forms: Forms:

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Help on Above

Forms: ( 0 1 2) ( 1 0 1) ( 0 0 1)

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Physical Properties of Tetradymite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Steel gray, Yellow gray.
Help on Density: Density: 7.2 - 7.9, Average = 7.55
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: steel gray
 

Optical Properties of Tetradymite

Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on RL Color: RL Color: White.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Tetradymite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   50.00   52.70 
   
 420 nm   50.80   53.60 
 440 nm   51.60   54.50 
 460 nm   52.00   55.00 
 480 nm   52.40   55.40 
 500 nm   52.70   55.80 
 520 nm   53.00   56.20 
 540 nm   53.20   56.40 
 560 nm   53.30   56.50 
 580 nm   53.40   56.60 
 600 nm   53.50   56.70 
 620 nm   53.50   56.80 
 640 nm   53.40   56.90 
 660 nm   53.40   57.00 
 680 nm   53.40   57.10 
 700 nm   53.50   57.20 
Calculated Relative Intensity Colors of Tetradymite in Air
Relative
Intensity
   0%   20%   40%   60%   80% 100% 120% 140% 160% 170%
R1                    
R2                    
 

Calculated Properties of Tetradymite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.19 gm/cc
note: Specific Gravity of Tetradymite =7.63 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETetradymite =1,313.02 barns/electron
U=PETetradymite x rElectron Density=8,125.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tetradymite is Not Radioactive
 

Tetradymite Classification

Help on  Dana Class: Dana Class: 02.11.07.01 (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)
 
02.11.07.01 Tetradymite Bi2Te2S R 3m 3 2/m
 
02.11.07.02 Tellurobismuthite Bi2Te3 R 3m 3 2/m
 
02.11.07.03 Tellurantimony Sb2Te3 R 3m 3 2/m
 
02.11.07.04 Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m
 
02.11.07.05 Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m
 
02.11.07.06 Skippenite Bi2Se2(Te,S) R 3m 3 2/m
 
02.11.07.07 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 Tetradymite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Tetradymite :
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 - Scandinavian mineral gallery
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Tetradymite Specimen Label here :

Tetradymite

Bi2Te2S
Dana No: 02.11.07.01 Strunz No: 02.DC.05c
Locality:

 

Notes:

 

 
   
 


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