Laforetite Mineral Data (original) (raw)

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 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

RelativeIntensity 0% 40% 80% 100% 120% 160% 200% 240% 280% 320% 360%
R

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:

02.09.01.06 (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)

02.09.01.01 Chalcopyrite CuFeS2 I 42d 4 2m

02.09.01.02 Eskebornite CuFeSe2 I 42d 4 2m

02.09.01.03 Gallite CuGaS2 I 42d 4 2m

02.09.01.04 Roquesite CuInS2 I 42d 4 2m

02.09.01.05 Lenaite AgFeS2 P 42mc 4mm

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

Laforetite

AgInS2
Dana No: 02.09.01.06 Strunz No: 02.CB.10a
Locality:

Notes: