Mineralogy Database

Thalfenisite Mineral Data

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General Thalfenisite Information

Help on Chemical  Formula: Chemical Formula: Tl6(Fe,Ni,Cu)25S26Cl
Help on Composition: Composition: Molecular Weight = 3,510.71 gm
   Thallium  34.93 %  Tl
   Iron      31.82 %  Fe
   Copper     1.81 %  Cu
   Nickel     6.69 %  Ni
   Sulfur    23.75 %  S
   Chlorine   1.01 %  Cl
            100.00 % 
Help on Empirical Formula: Empirical Formula: Tl6Fe2+20Ni4CuS26Cl
Help on Environment: Environment: In pentlandite-galena-chalcopyrite ores, localized at the contact of chalcopyrite and galena and included in pentlandite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Oktyabr mine, Norilsk, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition (Tl, Fe, Ni, S).
Help on Name Pronunciation: Name Pronunciation: Thalfenisite + Pronunciation Say THALFENISITE

Thalfenisite Image

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Comments: Polished 2mm fragment of thalfenisite in epoxy mount..
Location: Oktyabr'sky mine, Noril'sk, Siberia, Russia. Scale: 1.2cm across.
© Tom Loomis / Dakota Matrix

Thalfenisite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.92, Z = 1; V = 1,302.17 Den(Calc)= 4.48
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: P m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.96(1), 3.42(0.9), 3.24(0.7),

Physical Properties of Thalfenisite

Help on Color: Color: Bronze brown, Greenish brown.
Help on Density: Density: 5.26
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 1-1.5 - Talc or a little harder
Help on Luster: Luster: Metallic

Optical Properties of Thalfenisite

Help on RL Color: RL Color: Brown in air, dark brown in oil.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Thalfenisite in Air
λ R  ∑ R(λ) 
 400 nm   24.20   
 440 nm   23.60 
 480 nm   23.60 
 520 nm   24.30 
 560 nm   25.60 
 600 nm   27.30 
 640 nm   28.70 
 700 nm   30.30 
Calculated Relative Intensity Colors of Thalfenisite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 370%

Calculated Properties of Thalfenisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.03 gm/cc
note: Specific Gravity of Thalfenisite =4.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0092815255
Boson Index = 0.9907184745
Help on Photoelectric: Photoelectric: PEThalfenisite = 586.20 barns/electron
U=PEThalfenisite x rElectron Density=2,363.83 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thalfenisite is Not Radioactive

Thalfenisite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.15.02)Djerfisherite Group Djerfisherite K6Na(Fe,Cu,Ni)25S26Cl P m3m 4/m 3 2/m Thalfenisite Tl6(Fe,Ni,Cu)25S26Cl P m3m 4/m 3 2/m Owensite (Ba,Pb)6(Cu,Fe,Ni)25S27 P m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 02.FC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  02.FC -With Cl, Br, I (halide-sulfides)
02.FC.05 Djerfisherite K6Na(Fe,Cu,Ni)25S26Cl P m3m 4/m 3 2/m
02.FC.05 Owensite (Ba,Pb)6(Cu,Fe,Ni)25S27 P m3m 4/m 3 2/m
02.FC.05 Thalfenisite Tl6(Fe,Ni,Cu)25S26Cl P m3m 4/m 3 2/m

Other Thalfenisite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Thalfenisite :
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.FC.05





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