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Thalfenisite Mineral Data
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General Thalfenisite Information
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 Chemical Formula: |
Tl6(Fe,Ni,Cu)25S26Cl |
| Composition: |
Molecular Weight = 3,510.71 gm |
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Thallium 34.93 % Tl |
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Iron 31.82 % Fe |
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Copper 1.81 % Cu |
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Nickel 6.69 % Ni |
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Sulfur 23.75 % S |
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Chlorine 1.01 % Cl |
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______ |
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100.00 % |
| Empirical Formula: |
Tl6Fe2+20Ni4CuS26Cl |
| Environment: |
In pentlandite-galena-chalcopyrite ores, localized at the contact of chalcopyrite and galena and included in pentlandite. |
| IMA Status: |
Approved IMA 1979 |
| Locality: |
Oktyabr mine, Norilsk, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the composition (Tl, Fe, Ni, S). |
| Name Pronunciation: |
Thalfenisite + Pronunciation  |
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Thalfenisite Image |
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Images:
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Thalfenisite Crystallography
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| Cell Dimensions: |
a = 10.92, Z = 1; V = 1,302.17 Den(Calc)= 4.48 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: P m3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.96(1), 3.42(0.9), 3.24(0.7), |
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Physical Properties of Thalfenisite
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| Color: |
Bronze brown, Greenish brown. |
| Density: |
5.26 |
| Diaphaneity: |
Opaque |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
1-1.5 - Talc or a little harder |
| Luster: |
Metallic |
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Optical Properties of Thalfenisite
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| RL Color: |
Brown in air, dark brown in oil. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Thalfenisite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
24.20 |
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| 440 nm |
23.60 |
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| 480 nm |
23.60 |
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| 520 nm |
24.30 |
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| 560 nm |
25.60 |
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| 600 nm |
27.30 |
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| 640 nm |
28.70 |
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| 700 nm |
30.30 |
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Calculated Relative Intensity Colors of Thalfenisite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
370% |
| R |
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Calculated Properties of Thalfenisite
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| Electron Density: |
Bulk Density (Electron Density)=4.03 gm/cc
note: Specific Gravity of Thalfenisite =4.48 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0092815255
Boson Index = 0.9907184745 |
| Photoelectric: |
PEThalfenisite = 586.20 barns/electron
U=PEThalfenisite x rElectron Density=2,363.83 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thalfenisite is Not Radioactive |
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Thalfenisite Classification
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| Dana Class: |
02.15.02.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.15)(Chlorides) |
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(02.15.02)Djerfisherite Group |
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02.15.02.01 Djerfisherite K6Na(Fe,Cu,Ni)25S26Cl P m3m 4/m 3 2/m |
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02.15.02.02 Thalfenisite Tl6(Fe,Ni,Cu)25S26Cl P m3m 4/m 3 2/m |
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02.15.02.03 Owensite (Ba,Pb)6(Cu,Fe,Ni)25S27 P m3m 4/m 3 2/m |
| Strunz Class: |
02.FC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O |
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02.FC -With Cl, Br, I (halide-sulfides) |
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02.FC.05 Djerfisherite K6Na(Fe,Cu,Ni)25S26Cl P m3m 4/m 3 2/m |
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02.FC.05 Owensite (Ba,Pb)6(Cu,Fe,Ni)25S27 P m3m 4/m 3 2/m |
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02.FC.05 Thalfenisite Tl6(Fe,Ni,Cu)25S26Cl P m3m 4/m 3 2/m |
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Other Thalfenisite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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Thalfenisite
Tl6(Fe,Ni,Cu)25S26Cl
Dana No: 02.15.02.02 Strunz No: 02.FC.05
Locality:
Notes:
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