Laforetite Mineral Data


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General Laforetite Information

Help on Chemical  Formula: Chemical Formula: AgInS2
Help on Composition: Composition: Molecular Weight = 286.82 gm
   Indium  40.03 %  In
   Silver  37.61 %  Ag
   Sulfur  22.36 %  S
          ______ 
          100.00 % 
Help on Empirical Formula: Empirical Formula: AgInS2
Help on Environment: Environment: Breccia vein sample from the mine dumps. Microscopic inclusions in galena.
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: The disused Montgros mine (Pinols claim), near the hamlet La Boriette, about 10 km SW of Langeac, Haute-Loire, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Claude P. Laforet (1936-) a metallographer at the Bureau de Recherches Geologiques et Minieres, who first observed the mineral from the Montgros mine.
Help on Synonym: Synonym: IMA1995-006
 

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Laforetite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.90646
Help on Cell Dimensions: Cell Dimensions: a = 5.88, c = 11.21, Z = 4; V = 387.58 Den(Calc)= 4.92
Help on Crystal System: Crystal System: Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.351(1), 2.942(0.8), 1.768(0.8),2.03(0.75), 2.082(0.75), 1.189(0.4), 1.707(0.35),
 

Physical Properties of Laforetite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown.
Help on Diaphaniety: Diaphaniety: Opaque
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: chocolate brown
 

Optical Properties of Laforetite

Help on RL Anisotrophism: RL Anisotrophism: Strong, brick-red with an orange tint to bluish-gray purplish.
Help on RL Color: RL Color: Brownish gray in oil with abundant strawberry red internal reflections.
Help on RL Pleochroism: RL Pleochroism: Weak, from brown to brown-gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Laforetite in Air
λ R  ∑ R(λ) 
 480 nm   26.00   
 540 nm   24.60 
 580 nm   24.20 
 640 nm   24.60 
Calculated Relative Intensity Colors of Laforetite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360%
R                      
 

Calculated Properties of Laforetite

Help on Electron Density: Electron Density:

relectron=4.39 gm/cc
note: rLaforetite =4.92 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00167
Boson Index = 0.99833
Help on Photoelectric: Photoelectric:

PELaforetite = 213.69 barns/electron
U=PELaforetite x relectron= 938.38 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laforetite is Not Radioactive

 

Laforetite Classification

Help on  Dana Class: Dana Class: 2.9.1.6 (2)Sulfides - Including Selenides and Tellurides
  (2.9)where Am Bn Xp, with (m+n):p=1:1
  (2.9.1)Chalcopyrite Group (Tetragonal: I4¯2d)
 
2.9.1.1 Chalcopyrite CuFeS2 I 42d 4 2m
 
2.9.1.2 Eskebornite CuFeSe2 I 42d 4 2m
 
2.9.1.3 Gallite CuGaS2 I 42d 4 2m
 
2.9.1.4 Roquesite CuInS2 I 42d 4 2m
 
2.9.1.5 Lenaite AgFeS2 I 42d 4 2m
 
2.9.1.6 Laforetite ! AgInS2 I 42d 4 2m
Help on  Strunz Class: Strunz Class: II/C.03-50 II - Sulfides and sulphosalts
  II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1
  II/C.03 - Chalcopyrite group and related compounds
 
II/C.03-10 Chalcopyrite CuFeS2 I 42d 4 2m
 
II/C.03-20 Eskebornite CuFeSe2 I 42d 4 2m
 
II/C.03-25 Lenaite AgFeS2 I 42d 4 2m
 
II/C.03-30 Gallite CuGaS2 I 42d 4 2m
 
II/C.03-40 Roquesite CuInS2 I 42d 4 2m
 
II/C.03-50 Laforetite AgInS2 I 42d 4 2m
 

Other Laforetite Information

Help on References: References: NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(AmMin, v 85, p 875)
Help on See Also: See Also: Links to other databases for Laforetite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Laforetite Specimen Label here :

Laforetite

AgInS2
Dana No: 2.9.1.6 Strunz No: II/C.03-50
Locality:

 

Notes:

 

 
   
 
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