Mineralogy Database

Thalcusite Mineral Data

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General Thalcusite Information

Help on Chemical  Formula: Chemical Formula: TlCu3FeS4
Help on Composition: Composition: Molecular Weight = 579.13 gm
   Thallium  35.29 %  Tl
   Iron       9.64 %  Fe
   Copper    32.92 %  Cu
   Sulfur    22.15 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: TlCu3Fe2+S4
Help on Environment: Environment: In base-metal sulfide deposits and in high-alkali massifs.
Help on IMA Status: IMA Status: Approved IMA 1976
Help on Locality: Locality: Talnakh, Taimyr Peninsula, Noril'sk region, Yakutiya, Western Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition, THALlium, CUprum (Copper), and Sulfur.
Help on Name Pronunciation: Name Pronunciation: Thalcusite + Pronunciation Say THALCUSITE

Thalcusite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:3.41318
Help on Cell Dimensions: Cell Dimensions: a = 3.882, c = 13.25, Z = 1; V = 199.68 Den(Calc)= 4.82
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.53(1), 2.91(1), 3.73(0.8),

Physical Properties of Thalcusite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Bronze, Black.
Help on Density: Density: 6.15
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Metallic

Optical Properties of Thalcusite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, light yellowish to very dark gray.
Help on RL Color: RL Color: Rose-gray to pale lilac..
Help on RL Pleochroism: RL Pleochroism: Weak, in pale gray with brownish lilac tint to dark gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Thalcusite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 440 nm   29.30   30.70 
 460 nm   29.40   31.30 
 480 nm   29.60   31.10 
 500 nm   29.80   30.80 
 520 nm   29.70   30.80 
 540 nm   28.40   29.90 
 560 nm   27.90   29.80 
 580 nm   27.90   30.30 
 600 nm   28.40   30.30 
 620 nm   29.20   32.10 
 640 nm   29.70   33.00 
 660 nm   30.60   33.70 
 680 nm   30.70   34.50 
 700 nm   31.70   35.90 
Calculated Relative Intensity Colors of Thalcusite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 310%

Calculated Properties of Thalcusite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.29 gm/cc
note: Specific Gravity of Thalcusite =4.82 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0037054338
Boson Index = 0.9962945662
Help on Photoelectric: Photoelectric: PEThalcusite = 602.55 barns/electron
U=PEThalcusite x rElectron Density=2,587.68 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thalcusite is Not Radioactive

Thalcusite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.05)where Am Bn Xp, with (m+n):p=3:2
  (02.05.05)Thalcusite Group Thalcusite TlCu3FeS4 I 4/mmm 4/m 2/m 2/m Bukovite Tl2Cu3FeSe4 I 4/mmm 4/m 2/m 2/m Murunskite K2Cu3FeS4 I 4/mmm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.BD.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BD -With Hg, Tl
02.BD.30 Bukovite Tl2Cu3FeSe4 I 4/mmm 4/m 2/m 2/m
02.BD.30 Murunskite K2Cu3FeS4 I 4/mmm 4/m 2/m 2/m
02.BD.30 Thalcusite TlCu3FeS4 I 4/mmm 4/m 2/m 2/m

Other Thalcusite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Thalcusite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 02.BD.30





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