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Thalcusite Mineral Data
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General Thalcusite Information
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 Chemical Formula: |
TlCu3FeS4 |
| Composition: |
Molecular Weight = 579.13 gm |
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Thallium 35.29 % Tl |
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Iron 9.64 % Fe |
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Copper 32.92 % Cu |
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Sulfur 22.15 % S |
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______ |
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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
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| 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 Dipyramidal H-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), |
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Physical Properties of Thalcusite
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| 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 |
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Optical Properties of Thalcusite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 440 nm |
29.30 |
30.70 |
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| 460 nm |
29.40 |
31.30 |
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| 480 nm |
29.60 |
31.10 |
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| 500 nm |
29.80 |
30.80 |
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| 520 nm |
29.70 |
30.80 |
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| 540 nm |
28.40 |
29.90 |
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| 560 nm |
27.90 |
29.80 |
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| 580 nm |
27.90 |
30.30 |
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| 600 nm |
28.40 |
30.30 |
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| 620 nm |
29.20 |
32.10 |
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| 640 nm |
29.70 |
33.00 |
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| 660 nm |
30.60 |
33.70 |
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| 680 nm |
30.70 |
34.50 |
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| 700 nm |
31.70 |
35.90 |
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Calculated Relative Intensity Colors of Thalcusite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
310% |
| R1 |
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| R2 |
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Calculated Properties of Thalcusite
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| Electron Density: |
Bulk Density (Electron Density)=4.29 gm/cc
note: Specific Gravity of Thalcusite =4.82 gm/cc.
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| 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.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thalcusite is Not Radioactive |
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Thalcusite Classification
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| Dana Class: |
02.05.05.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.05)where Am Bn Xp, with (m+n):p=3:2 |
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(02.05.05)Thalcusite Group |
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02.05.05.01 Thalcusite TlCu3FeS4 I 4/mmm 4/m 2/m 2/m |
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02.05.05.02 Bukovite Tl2Cu3FeSe4 I 4/mmm 4/m 2/m 2/m |
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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 |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BD -With Hg, Tl |
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02.BD.30 Bukovite Tl2Cu3FeSe4 I 4/mmm 4/m 2/m 2/m |
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02.BD.30 Murunskite K2Cu3FeS4 I 4/mmm 4/m 2/m 2/m |
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02.BD.30 Thalcusite TlCu3FeS4 I 4/mmm 4/m 2/m 2/m |
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Other Thalcusite Information
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| 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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Thalcusite
TlCu3FeS4
Dana No: 02.05.05.01 Strunz No: 02.BD.30
Locality:
Notes:
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