Rohaite Mineral Data

Rohaite Mineral Data
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General Rohaite Information

Help on Chemical Formula: Chemical Formula: TlCu5SbS2
Help on Composition: Composition: Molecular Weight = 708.00 gm
   Thallium  28.87 %  Tl
   Copper    44.88 %  Cu
   Antimony  17.20 %  Sb
   Sulfur     9.06 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: TlCu5SbS2
Help on Environment: Environment: In veins cutting an alkalic intrusive.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Ilimaussaq intrusion, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Rose-Hansen, (1937-), Danish mineralogist.
Help on Name Pronunciation: Name Pronunciation: Rohaite Say ROHAITE
 

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Rohaite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =2:1:5.5211
Help on Cell Dimensions: Cell Dimensions: a = 7.602, b = 3.801, c = 20.986, Z = 4; V = 606.39 Den(Calc)= 7.75
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P mmm ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.393(1), 3.078(1), 3.8(0.9),
 

Physical Properties of Rohaite

Help on Color: Color: Steel gray.
Help on Density: Density: 7.78
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Malleable - Deforms rather than breaking apart with a hammer.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Metallic
 

Optical Properties of Rohaite

Help on RL Anisotrophism: RL Anisotrophism: Very strong, from yellowish cream to black, with dark red-purple colors present at extinction.
Help on RL Color: RL Color: Yellowish cream to dull bluish gray.
Help on RL Pleochroism: RL Pleochroism: Distinct to strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Rohaite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   27.90   36.20 
   
 420 nm   27.70   36.40 
 440 nm   27.50   36.60 
 460 nm   26.80   36.70 
 480 nm   25.90   36.50 
 500 nm   25.20   36.10 
 520 nm   24.50   36.00 
 540 nm   23.90   35.40 
 560 nm   23.60   35.20 
 580 nm   23.40   35.00 
 600 nm   23.20   34.60 
 620 nm   23.30   34.40 
 640 nm   23.10   34.00 
 660 nm   22.90   33.90 
 680 nm   22.60   33.70 
 700 nm   22.30   33.70 
Calculated Relative Intensity Colors of Rohaite in Air
Relative
Intensity		    0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 380%
R1                        
R2                        
 

Calculated Properties of Rohaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.76 gm/cc
note: Specific Gravity of Rohaite =7.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0006793689
Boson Index = 0.9993206311
Help on Photoelectric: Photoelectric: PERohaite = 566.47 barns/electron
U=PERohaite x rElectron Density=3,832.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rohaite is Not Radioactive
 

Rohaite Classification
Help on Dana Class: Dana Class: 03.07.16.01 (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.16)Dana Group
 
03.07.16.01 Rohaite TlCu5SbS2 P mmm ? 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 02.BD.35 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.35 Rohaite TlCu5SbS2 P mmm ? 2/m 2/m 2/m
 

Other Rohaite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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 :

Rohaite

TlCu5SbS2
Dana No: 03.07.16.01 Strunz No: 02.BD.35
Locality:

 

Notes: