SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Laforêtite

This page is currently not sponsored. Click here to sponsor this page.
04042840015921700752019.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
06384670015921700769335.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
00309290014972473953063.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
05598720015921507275054.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
07496290015921504602818.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
06585130014961628151146.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
04042840015921700752019.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
09000080015921508004386.jpg
Laforêtite, etc.

Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
Hide all sections | Show all sections

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.
Chalcopyrite Group.


Classification of LaforêtiteHide

IMA status:
Approved
Approval year:
1995
Strunz 8th ed.:
2/C.03-45
Nickel-Strunz 10th (pending) ed.:
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

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

Optical Data of LaforêtiteHide

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
Elements listed:
Ag, In, S - search for minerals with similar chemistry
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

Type Locality:
ⓘ Montgros Mine, Pinols, Brioude, Haute-Loire, Auvergne-Rhône-Alpes, France
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:
SphaleriteQuartzGalenaCalciteBaryte

Synonyms of LaforêtiteHide

Other Language Names for LaforêtiteHide

Relationship of Laforêtite to other SpeciesHide

Member of:
Chalcopyrite Group
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.05aStilleiteZnSeIso. 4 3m : F4 3m
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. 4 3m : P4 3m
2.CB.30NekrasoviteCu26V2(Sn,As,Sb)6S32Iso.
2.CB.30StibiocolusiteCu13V(Sb,Sn,As)3S16Iso. 4 3m : P4 3m
2.CB.30Ovamboite Cu20(Fe,Cu,Zn)6W2Ge6S32Iso.
2.CB.30MaikainiteCu20(Fe,Cu)6Mo2Ge6S32Iso. m3m (4/m 3 2/m)
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. 4 3m : P4 3m
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 Governorate
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
      • Brioude
        • Pinols
Meisser N. et al (1999) European Journal of Mineralogy 11: 891-897.
Japan
 
  • Hokkaidō Prefecture
    • Ishikari Subprefecture
      • Sapporo City
        • 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.
Quick NavTopAbout LaforêtiteClassification Physical Properties Optical Data Chemical Properties Crystallography X-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesRelationshipsNickel-StrunzOther InformationReferences Internet Links Localities Locality List
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2021, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us - Report a bug/vulnerability Current server date and time: March 8, 2021 09:36:38 Page generated: December 26, 2020 05:45:49
Go to top of page