Mineralogy Database

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

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 - Scalenohedral H-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 Diaphaneity: Diaphaneity: 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
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360%

Calculated Properties of Laforetite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.39 gm/cc
note: Specific Gravity of Laforetite =4.92 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0016769739
Boson Index = 0.9983230261
Help on Photoelectric: Photoelectric: PELaforetite = 213.69 barns/electron
U=PELaforetite x rElectron Density= 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: (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.01)Chalcopyrite Group (Tetragonal: I-42d) Chalcopyrite CuFeS2 I 42d 4 2m Eskebornite CuFeSe2 I 42d 4 2m Gallite CuGaS2 I 42d 4 2m Roquesite CuInS2 I 42d 4 2m Lenaite AgFeS2 P 42mc 4mm Laforetite! AgInS2 I 42d 4 2m
Help on  Strunz Class: Strunz Class: 02.CB.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.C - Metal Sulfides, M:S = 1:1 (and similar)
  02.CB -With Zn, Fe, Cu, Ag, Au, etc
02.CB.10a Chalcopyrite CuFeS2 I 42d 4 2m
02.CB.10a Eskebornite CuFeSe2 I 42d 4 2m
02.CB.10a Gallite CuGaS2 I 42d 4 2m
02.CB.10a Laforetite! AgInS2 I 42d 4 2m
02.CB.10a Lenaite AgFeS2 P 42mc 4mm
02.CB.10a Roquesite CuInS2 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 02.CB.10a





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