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Laforêtite

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About LaforêtiteHide

Formula:
AgInS2
Colour:
Brown
Lustre:
Metallic
Hardness:
3
Specific Gravity:
4.93 (Calculated)
Crystal System:
Tetragonal
Name:
Named for Claude P. Laforêt (b. 1936), metallographer at the Bureau de Recherches Géologiques et Minières, who first observed the mineral at the Montgros Mine.

Classification of LaforêtiteHide

Approved
Approval Year:
1995
2.CB.10a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.

Physical Properties of LaforêtiteHide

Metallic
Transparency:
Opaque
Colour:
Brown
Streak:
Chocolate brown
Hardness:
Hardness:
VHN100=183 kg/mm2 - Vickers
Hardness Data:
Estimated
Cleavage:
None Observed
Density:
4.93(1) g/cm3 (Calculated)

Optical Data of LaforêtiteHide

Type:
Anisotropic
Anisotropism:
Strong, brick red with orange tint to bluish-grey purplish
Reflectivity:
480nmR=26%
540nmR=24.6%
580nmR=24.2%
660nmR=25.8%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 26%.
Colour in reflected light:
Brownish grey
Internal Reflections:
strawberry red
Pleochroism:
Weak
Comments:
Brown to clear brown-grey tints

Chemical Properties of LaforêtiteHide

Formula:
AgInS2
Common Impurities:
Cu,Fe,Se

Crystallography of LaforêtiteHide

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2d
Cell Parameters:
a = 5.880(2) Å, c = 11.21(1) Å
Ratio:
a:c = 1 : 1.906
Unit Cell V:
387.57 ų
Z:
4
Twinning:
Polysynthetic lamellar observed in polished sections.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.351 Å(100)
2.942 Å(80)
2.082 Å(75)
2.035 Å(75)
1.768 Å(80)
1.707 Å(35)
1.189 Å(40)
Comments:
From synthetic material because of small size of grains.

Type Occurrence of LaforêtiteHide

General Appearance of Type Material:
tiny < 30 μm anhedral inclusions in galena
Place of Conservation of Type Material:
Geological Museum of Lausanne, Switzerland (no. MGL 58600) and fragments of holotype material, with submicroscopic lafortite inclusions, are also deposited at the Galerie de Mineralogie, Museum National d'Histoire Naturelle, Paris, France.
Geological Setting of Type Material:
brecciated vein sample from the mine dump
Associated Minerals at Type Locality:

Synonyms of LaforêtiteHide

Other Language Names for LaforêtiteHide

Relationship of Laforêtite to other SpeciesHide

Other Members of this group:
ChalcopyriteCuFeS2Tet. 4 2m : I4 2d
EskeborniteCuFeSe2Tet.
GalliteCuGaS2Tet. 4 2m : I4 2d
LenaiteAgFeS2Tet. 4 2m : I4 2d
RoquesiteCuInS2Tet. 4 2m : I4 2d
ShenzhuangiteNiFeS2Tet. 4 2m : I4 2d
Unnamed (Cu-Mn-Sn Sulfide)Cu2MnSnS4

Related Minerals - Nickel-Strunz GroupingHide

2.CB.AgmantiniteAg2MnSnS4Orth.
2.CB.05aColoradoiteHgTeIso. m3m (4/m 3 2/m)
2.CB.05aHawleyiteCdSIso. 4 3m : F4 3m
2.CB.05aMetacinnabarHgSIso. 4 3m : F4 3m
2.CB.05cPolhemusite(Zn,Hg)STet.
2.CB.05bSakuraiite(Cu,Zn,Fe)3(In,Sn)S4Iso.
2.CB.05aSphaleriteZnSIso. 4 3m : F4 3m
2.CB.05aStilleiteZnSe
2.CB.05aTiemanniteHgSeIso. 4 3m : F4 3m
2.CB.05UM1998-15-S:CuFeZnCu2Fe3Zn5S10
2.CB.05aRudashevskyite(Fe,Zn)SIso. 4 3m : F4 3m
2.CB.10aChalcopyriteCuFeS2Tet. 4 2m : I4 2d
2.CB.10aEskeborniteCuFeSe2Tet.
2.CB.10aGalliteCuGaS2Tet. 4 2m : I4 2d
2.CB.10bHaycockiteCu4Fe5S8Orth. 2 2 2
2.CB.10aLenaiteAgFeS2Tet. 4 2m : I4 2d
2.CB.10bMooihoekiteCu9Fe9S16Tet.
2.CB.10bPutoraniteCu1.1Fe1.2S2Iso.
2.CB.10aRoquesiteCuInS2Tet. 4 2m : I4 2d
2.CB.10bTalnakhiteCu9(Fe,Ni)8S16Iso. 4 3m : I4 3m
2.CB.15aČernýiteCu2(Cd,Zn,Fe)SnS4Tet. 4 2m : I4 2m
2.CB.15aFerrokësteriteCu2FeSnS4Tet. 4 : I4
2.CB.15aHocartiteAg2(Fe2+,Zn)SnS4Tet. 4 2m : I4 2m
2.CB.15aIdaiteCu5FeS6Hex.
2.CB.15aKësterite Cu2ZnSnS4Tet. 4 : I4
2.CB.15aKuramiteCu3SnS4Tet.
2.CB.15bMohiteCu2SnS3Mon.
2.CB.15aPirquitasiteAg2ZnSnS4Tet. 4 : I4
2.CB.15aStanniteCu2FeSnS4Tet. 4 2m : I4 2m
2.CB.15cStannoiditeCu+6Cu2+2(Fe2+,Zn)3Sn2S12Orth.
2.CB.15aVelikiteCu2HgSnS4Tet.
2.CB.15cUM2006-11-S:CuFeGeZnCu8(Fe,Zn)3Ge2S12 (?)
2.CB.20ChatkaliteCu6FeSn2S8Tet. 4 2m : P4m2
2.CB.20MawsoniteCu6Fe2SnS8Tet. 4 2m : P4m2
2.CB.30ColusiteCu13VAs3S16Iso. 4 3m : P4 3n
2.CB.30GermaniteCu13Fe2Ge2S16Iso. 4 3m : P4 3n
2.CB.30GermanocolusiteCu26V2(Ge,As)6S32Iso.
2.CB.30NekrasoviteCu26V2(Sn,As,Sb)6S32Iso.
2.CB.30StibiocolusiteCu13V(Sb,Sn,As)3S16Iso.
2.CB.30Ovamboite Cu20(Fe,Cu,Zn)6W2Ge6S32Iso.
2.CB.30MaikainiteCu20(Fe,Cu)6Mo2Ge6S32
2.CB.35aHemusiteCu6SnMoS8Iso.
2.CB.35aKiddcreekiteCu6SnWS8Iso. 4 3m : F4 3m
2.CB.35aPolkovicite(Fe,Pb)3(Ge,Fe)1-xS4Iso.
2.CB.35aRenierite(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16Tet. 4 2m : P4 2c
2.CB.35aVincienniteCu+7Cu2+3Fe2+2Fe3+2Sn(As,Sb)S16Tet.
2.CB.35aMorozeviczite(Pb,Fe)3Ge1-xS4Iso.
2.CB.35bCatamarcaiteCu6GeWS8Hex. 6mm : P63mc
2.CB.40LautiteCuAsSOrth. mmm (2/m 2/m 2/m) : Pnma
2.CB.45CadmoseliteCdSeHex. 6mm : P63mc
2.CB.45GreenockiteCdSHex. 6mm : P63mc
2.CB.45Wurtzite(Zn,Fe)SHex. 6mm : P63mc
2.CB.45RambergiteMnSHex. 6mm : P63mc
2.CB.45Buseckite(Fe,Zn,Mn)SHex. 6mm : P63mc
2.CB.55aCubaniteCuFe2S3Orth. mmm (2/m 2/m 2/m)
2.CB.55bIsocubaniteCuFe2S3Iso. m3m (4/m 3 2/m) : Fm3m
2.CB.60PicotpauliteTlFe2S3Orth. mmm (2/m 2/m 2/m) : Cmcm
2.CB.60RaguiniteTlFeS2Orth.
2.CB.65ArgentopyriteAgFe2S3Mon. 2/m
2.CB.65SternbergiteAgFe2S3Orth. mmm (2/m 2/m 2/m)
2.CB.70SulvaniteCu3VS4Iso.
2.CB.75VulcaniteCuTeOrth.
2.CB.80EmpressiteAgTeOrth. mmm (2/m 2/m 2/m)
2.CB.85MuthmanniteAuAgTe2Mon. 2/m : P2/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LaforêtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Meisser, N., Thelin, P., Chiappero, P.J., Maurel, C. (1999) Laforêtite, AgInS2, a new mineral of the chalcopyrite group from the Montgros mine, Haute-Loire, France. European Journal of Mineralogy: 11: 891-897.
Jambor, J.L., Kovalenker, V.A., Roberts, A.C. (2000) New mineral names. American Mineralogist: 85: 873-877.
Mandarino, J.A. (2000) Abstracts of new mineral descriptions. Mineralogical Record: 31(4): 363-372.

Internet Links for LaforêtiteHide

Localities for LaforêtiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Egypt
 
  • South Sinai
Sallam, O. R., Alshami, A. S., Azab, M. S., & El Akeed, I. A. (2014) The Occurrence of Silver-Gold Mineralization Associated With Uranium Bearing Minerals and Base Metal Sulphide, El Sheikh Soliman Area, South Sinai, Egypt. Egyptian Journal of Pure and Applied Science 52(1):47-54
France (TL)
 
  • Auvergne-Rhône-Alpes
    • Haute-Loire
      • Pinols
        • Pinols
Meisser N. et al (1999) European Journal of Mineralogy 11: 891-897.
Japan
 
  • Hokkaidō
    • Sapporo
      • Minami-ku
Ishihara, S., & Matsueda, H. (2011). Chemical characteristics of the indium-polymetallic ores from the Toyoha mine, Hokkaido, Japan. Bulletin of the Geological Survey of Japan, 62(3/4), 131-142.
 
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