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Rohaite Mineral Data
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General Rohaite Information
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 Chemical Formula: |
TlCu5SbS2 |
| Composition: |
Molecular Weight = 708.00 gm |
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Thallium 28.87 % Tl |
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Copper 44.88 % Cu |
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Antimony 17.20 % Sb |
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Sulfur 9.06 % S |
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______ |
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100.00 % |
| Empirical Formula: |
TlCu5SbS2 |
| Environment: |
In veins cutting an alkalic intrusive. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
Ilimaussaq intrusion, Greenland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for John Rose-Hansen, (1937-), Danish mineralogist. |
| Name Pronunciation: |
Rohaite  |
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Rohaite Crystallography
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| Axial Ratios: |
a:b:c =2:1:5.5211 |
| Cell Dimensions: |
a = 7.602, b = 3.801, c = 20.986, Z = 4; V = 606.39 Den(Calc)= 7.75 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P mmm ? |
| X Ray Diffraction: |
By Intensity(I/Io): 2.393(1), 3.078(1), 3.8(0.9), |
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Physical Properties of Rohaite
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| Color: |
Steel gray. |
| Density: |
7.78 |
| Diaphaneity: |
Opaque |
| Fracture: |
Malleable - Deforms rather than breaking apart with a hammer. |
| Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
3-3.5 - Calcite-Copper Penny |
| Luster: |
Metallic |
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Optical Properties of Rohaite
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| RL Anisotrophism: |
Very strong, from yellowish cream to black, with dark red-purple colors present at extinction. |
| RL Color: |
Yellowish cream to dull bluish gray. |
| RL Pleochroism: |
Distinct to strong. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Rohaite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
27.90 |
36.20 |
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| 420 nm |
27.70 |
36.40 |
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| 440 nm |
27.50 |
36.60 |
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| 460 nm |
26.80 |
36.70 |
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| 480 nm |
25.90 |
36.50 |
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| 500 nm |
25.20 |
36.10 |
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| 520 nm |
24.50 |
36.00 |
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| 540 nm |
23.90 |
35.40 |
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| 560 nm |
23.60 |
35.20 |
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| 580 nm |
23.40 |
35.00 |
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| 600 nm |
23.20 |
34.60 |
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| 620 nm |
23.30 |
34.40 |
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| 640 nm |
23.10 |
34.00 |
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| 660 nm |
22.90 |
33.90 |
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| 680 nm |
22.60 |
33.70 |
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| 700 nm |
22.30 |
33.70 |
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Calculated Relative Intensity Colors of Rohaite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
380% |
| R1 |
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| R2 |
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Calculated Properties of Rohaite
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| Electron Density: |
Bulk Density (Electron Density)=6.76 gm/cc
note: Specific Gravity of Rohaite =7.75 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0006793689
Boson Index = 0.9993206311 |
| Photoelectric: |
PERohaite = 566.47 barns/electron
U=PERohaite x rElectron Density=3,832.13 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rohaite is Not Radioactive |
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Rohaite Classification
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| Dana Class: |
03.07.16.01 (03)Sulfides - Sulfosalts |
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(03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.07.16)Dana Group |
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03.07.16.01 Rohaite TlCu5SbS2 P mmm ? 2/m 2/m 2/m |
| Strunz Class: |
02.BD.35 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.35 Rohaite TlCu5SbS2 P mmm ? 2/m 2/m 2/m |
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Other Rohaite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Rohaite :
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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Print or Cut-and-Paste your Rohaite Specimen Label here :
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Rohaite
TlCu5SbS2
Dana No: 03.07.16.01 Strunz No: 02.BD.35
Locality:
Notes:
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