Thalcusite Mineral Data

General Thalcusite Information

Chemical Formula:

TlCu3FeS4

Composition:

Molecular Weight = 579.13 gm

Thallium 35.29 % Tl

Iron 9.64 % Fe

Copper 32.92 % Cu

Sulfur 22.15 % S

______

100.00 %

Empirical Formula:

TlCu₃Fe²⁺S₄

Environment:

In base-metal sulfide deposits and in high-alkali massifs.

IMA Status:

Approved IMA 1976

Locality:

Talnakh, Taimyr Peninsula, Noril'sk region, Yakutiya, Western Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition, THALlium, CUprum (Copper), and Sulfur.

Name Pronunciation:

Thalcusite + Pronunciation

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Thalcusite Crystallography

Axial Ratios:

a:c = 1:3.41318

Cell Dimensions:

a = 3.882, c = 13.25, Z = 1; V = 199.68 Den(Calc)= 4.82

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.53(1), 2.91(1), 3.73(0.8),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Berger R , Journal of the Less-Common Metals , 147 (1989) p.141-148, Synthesis and characterization of the layered metal TlCu2S2, Locality: synthetic

Physical Properties of Thalcusite

Cleavage:

{???} Good

Color:

Bronze, Black.

Density:

6.15

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Optical Properties of Thalcusite

RL Anisotrophism:

Moderate, light yellowish to very dark gray.

RL Color:

Rose-gray to pale lilac..

RL Pleochroism:

Weak, in pale gray with brownish lilac tint to dark gray.

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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	310%
R₁
R₂

Calculated Properties of Thalcusite

Electron Density:

Bulk Density (Electron Density)=4.29 gm/cc
note: Specific Gravity of Thalcusite =4.82 gm/cc.

Fermion Index:

Fermion Index = 0.0037054338
Boson Index = 0.9962945662

Photoelectric:

PE_Thalcusite= 602.55 barns/electron
U=PE_Thalcusite x rElectron Density=2,587.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thalcusite is Not Radioactive

Thalcusite Classification

Dana Class:

02.05.05.01 (02)Sulfides - Including Selenides and Tellurides

(02.05)where Am Bn Xp, with (m+n):p=3:2

(02.05.05)Thalcusite Group

02.05.05.01 Thalcusite TlCu3FeS4 I 4/mmm 4/m 2/m 2/m

02.05.05.02 Bukovite Tl2Cu3FeSe4 I 4/mmm 4/m 2/m 2/m

02.05.05.03 Murunskite K2Cu3FeS4 I 4/mmm 4/m 2/m 2/m

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

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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

Thalcusite

TlCu3FeS4
Dana No: 02.05.05.01 Strunz No: 02.BD.30
Locality:

Notes: