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Chalcothallite Mineral Data
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General Chalcothallite Information
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 Chemical Formula: |
(Cu,Fe)6Tl2SbS4 |
| Composition: |
Molecular Weight = 1,016.96 gm |
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Thallium 40.19 % Tl |
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Iron 16.47 % Fe |
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Copper 18.75 % Cu |
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Antimony 11.97 % Sb |
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Sulfur 12.61 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu3Fe2+3Tl2SbS4 |
| Environment: |
In ussingite veins cutting poikilitic sodalite crystals. |
| IMA Status: |
Approved IMA 1967 |
| Locality: |
Near Taseq Lake, Ilimaussaq intrusion, Greenland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the composition (Cu, Tl). |
| Synonym: |
ICSD 100476 |
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PDF 42-557 |
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Chalcothallite Image |
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Images:
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Chalcothallite
Comments: Gray-black, platy chalcothallite aggregates in matrix.
Location: Taseq Slope, Ilimaussaq Complex, Narsaq, Kitaa, West Greenland, Denmark.
Scale: Specimen Size 6x20 mm.
© Diederik Visser |
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Chalcothallite Crystallography
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| Axial Ratios: |
a:c = 1:8.9574 |
| Cell Dimensions: |
a = 3.827, c = 34.28, Z = 2; V = 502.06 Den(Calc)= 6.73 |
| 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): 3.07(1), 2.48(0.9), 3.93(0.4), |
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Physical Properties of Chalcothallite
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| Cleavage: |
{001} Perfect, {100} Distinct, {010} Distinct |
| Color: |
Lead gray, Black. |
| Density: |
6.6 |
| Diaphaneity: |
Opaque |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Lamellar - Thin laminae producing a lamellar structure. |
| Habit: |
Tarnishes - Freshly fractured surfaces form a surface oxidation film |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Chalcothallite
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| Optical Data: |
NCalc= 1.7 - from Gladstone-Dale relationship (KC = 0.1035) where Ncalc=Dcalc*KC+1
NCalc= 1.68 - from Gladstone-Dale relationship (KC = 0.1035) where Ncalc=Dmeas*KC+1
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| RL Anisotrophism: |
Distinct in orange to red-brown. |
| RL Color: |
Creamy white to light gray with a brownish creamy tint. |
| RL Pleochroism: |
Noticeable in air. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Chalcothallite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
29.10 |
31.10 |
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| 420 nm |
28.20 |
31.30 |
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| 440 nm |
27.30 |
31.30 |
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| 460 nm |
26.60 |
31.10 |
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| 480 nm |
26.20 |
30.50 |
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| 500 nm |
25.80 |
30.30 |
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| 520 nm |
25.70 |
29.80 |
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| 540 nm |
25.40 |
29.10 |
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| 560 nm |
25.30 |
28.60 |
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| 580 nm |
25.10 |
28.20 |
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| 600 nm |
25.10 |
27.70 |
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| 620 nm |
25.10 |
27.40 |
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| 640 nm |
25.10 |
27.20 |
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| 660 nm |
25.00 |
27.20 |
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| 680 nm |
24.90 |
27.10 |
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| 700 nm |
25.00 |
27.20 |
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Calculated Relative Intensity Colors of Chalcothallite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
350% |
| R1 |
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| R2 |
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Calculated Properties of Chalcothallite
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| Electron Density: |
Bulk Density (Electron Density)=5.85 gm/cc
note: Specific Gravity of Chalcothallite =6.73 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0044385728
Boson Index = 0.9955614272 |
| Photoelectric: |
PEChalcothallite = 735.91 barns/electron
U=PEChalcothallite x rElectron Density=4,305.14 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chalcothallite is Not Radioactive |
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Chalcothallite Classification
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| Dana Class: |
03.02.07.01 (03)Sulfides - Sulfosalts |
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(03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.02.07)Dana Group |
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03.02.07.01 Chalcothallite (Cu,Fe)6Tl2SbS4 I 4/mmm 4/m 2/m 2/m |
| Strunz Class: |
02.BD.40 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.40 Chalcothallite (Cu,Fe)6Tl2SbS4 I 4/mmm 4/m 2/m 2/m |
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Other Chalcothallite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Chalcothallite :
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
15 - WWW-MINCRYST
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Chalcothallite
(Cu,Fe)6Tl2SbS4
Dana No: 03.02.07.01 Strunz No: 02.BD.40
Locality:
Notes:
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