Thalcusite Mineral Data (original) (raw)
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
X Ray Diffraction:
By Intensity(I/Io): 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 | R 2 |  |
∑ 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 |  |
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| 700 nm | 31.70 | 35.90 |  |
Calculated Relative Intensity Colors of Thalcusite in Air
| RelativeIntensity | 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:
PEThalcusite = 602.55 barns/electron
U=PEThalcusite 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: