Mineralogy Database

Lorandite Mineral Data

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General Lorandite Information

Help on Chemical Formula: Chemical Formula: TlAsS2
Help on Composition: Composition: Molecular Weight = 343.44 gm
   Thallium  59.51 %  Tl
   Arsenic   21.82 %  As
   Sulfur    18.67 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: TlAsS2
Help on Environment: Environment: Low-temperature hydrothermal mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1894
Help on Locality: Locality: Allchar, near Rozdan, northwest of Salonika, Macedonia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Eotovos Laorand (1848-1919), physicist of Budapest, Hungary.
Help on Name Pronunciation: Name Pronunciation: Lorandite + Pronunciation Say LORANDITE
Help on Synonym: Synonym: ICSD 81094
  PDF 19-1331
 

Lorandite Image

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  Fangite   Lorandite

Comments: Brown crystals of fangite with red lorandite.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag
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  Lorandite

Comments: Gemmy, transparent reddish brown crystals of lorandite on matrix.
Location: Allchar, near Majdan, Macedonia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Lorandite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.0837:1:0.5414
Help on Cell Dimensions: Cell Dimensions: a = 12.29, b = 11.34, c = 6.14, Z = 8; beta = 104.6° V = 828.09 Den(Calc)= 5.51
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.58(1), 3.59(0.6), 2.882(0.55),
Help on Forms: Forms:

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Help on Above

Forms: ( 3 2 1) ( 0 1 1) ( 2 0 1) ( 2 0 1) ( 2 1 0) ( 1 1 0) ( 0 0 1)

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Physical Properties of Lorandite

Help on Cleavage: Cleavage: {100} Perfect, {001} Distinct
Help on Color: Color: Red, Carmine red, Blackish lead gray.
Help on Density: Density: 5.5288 - 5.5362, Average = 5.53
Help on Diaphaneity: Diaphaneity: Subtransparent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: red
 

Optical Properties of Lorandite

Help on Optical Data: Optical Data: Biaxial (+), a=2.72, 2V(Meas)=70-90. Dispersion r >> v strong.
Help on Pleochroism (y): Pleochroism (y): purple-red.
Help on Pleochroism (z): Pleochroism (z): orange-red.
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Lorandite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   28.80   30.60 
   
 420 nm   28.70   30.70 
 440 nm   28.60   30.80 
 460 nm   28.40   30.90 
 480 nm   28.20   31.20 
 500 nm   27.80   31.10 
 520 nm   27.50   30.60 
 540 nm   27.00   29.80 
 560 nm   26.40   28.80 
 580 nm   25.80   27.70 
 600 nm   25.00   26.70 
 620 nm   24.40   26.00 
 640 nm   23.90   25.50 
 660 nm   23.50   25.00 
 680 nm   23.20   24.70 
 700 nm   22.90   24.50 
Calculated Relative Intensity Colors of Lorandite in Air
Relative
Intensity		    0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360%
R1                      
R2                      
 

Calculated Properties of Lorandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.68 gm/cc
note: Specific Gravity of Lorandite =5.51 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014005193
Boson Index = 0.9985994807
Help on Photoelectric: Photoelectric: PELorandite =1,047.21 barns/electron
U=PELorandite x rElectron Density=4,905.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lorandite is Not Radioactive
 

Lorandite Classification
Help on Dana Class: Dana Class: 03.07.06.01 (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.06)Dana Group
 
03.07.06.01 Lorandite TlAsS2 P 21/a 2/m
Help on Strunz Class: Strunz Class: 02.HD.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HD -With Tl
 
02.HD.05 Lorandite TlAsS2 P 21/a 2/m
 
02.HD.05 Weissbergite TlSbS2 P1 1
 

Other Lorandite Information
Help on References: References: NAME( AmMin) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Lorandite :
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 - Philatelic Mineralogy
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Lorandite

TlAsS2
Dana No: 03.07.06.01 Strunz No: 02.HD.05
Locality:

 

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