Laforêtite (original) (raw)
A valid IMA mineral species
About LaforêtiteHide
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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.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:7149:5
IMA Classification of LaforêtiteHide
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Classification of LaforêtiteHide
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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.
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Laf | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Laf | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of LaforêtiteHide
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Hardness:
VHN100=183 kg/mm2 - Vickers
Density:
4.93(1) g/cm3 (Calculated)
Optical Data of LaforêtiteHide
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Anisotropism:
Strong, brick red with orange tint to bluish-grey purplish
Reflectivity:
| Wavelength | R |
|---|---|
| 480nm | 26% |
| 540nm | 24.6% |
| 580nm | 24.2% |
| 660nm | 25.8% |
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
Comments:
Brown to clear brown-grey tints
Chemistry of LaforêtiteHide
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Common Impurities:
Cu,Fe,Se
Crystallography of LaforêtiteHide
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Crystal System:
Tetragonal
Class (H-M):
42_m_ - Scalenohedral
Cell Parameters:
a = 5.880(2) Å, c = 11.21(1) Å
Twinning:
Polysynthetic lamellar observed in polished sections.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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.
Geological EnvironmentHide
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Type Occurrence of LaforêtiteHide
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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
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Other Language Names for LaforêtiteHide
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Relationship of Laforêtite to other SpeciesHide
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Other Members of Chalcopyrite Group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 2.CB. | Richardsite | Zn2CuGaS4 | Tet. 42_m_ : I_42_m |
|---|---|---|---|
| 2.CB. | Okruginite | Cu2SnSe3 | Mon. m : B b |
| 2.CB. | Hanswilkeite | KFeS2 | Mon. 2/m : _B_2/b |
| 2.CB. | Auroselenide | AuSe | Mon. 2/m : _B_2/m |
| 2.CB. | Ruizhongite | (Ag2◻)Pb3Ge2S8 | Iso. 43_m_ : I_43_d |
| 2.CB. | Agmantinite | Ag2MnSnS4 | Orth. |
| 2.CB. | Tolstykhite | Au3S4Te6 | Tric. 1 : _P_1 |
| 2.CB. | Gachingite | Au(Te1-xSex) | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 2.CB.05a | Hawleyite | CdS | Iso. 43_m_ : F_43_m |
| 2.CB.05 | UM1998-15-S:CuFeZn | Cu2Fe3Zn5S10 | |
| 2.CB.05a | Coloradoite | HgTe | Iso. 43_m_ : F_43_m |
| 2.CB.05a | Metacinnabar | HgS | Iso. 43_m_ : F_43_m |
| 2.CB.05a | Tiemannite | HgSe | Iso. 43_m_ : F_43_m |
| 2.CB.05a | Sphalerite | ZnS | Iso. 43_m_ : F_43_m |
| 2.CB.05b | Sakuraiite | (Cu,Zn,Fe)3(In,Sn)S4 | Iso. |
| 2.CB.05c | Polhemusite | (Zn,Hg)S | Tet. |
| 2.CB.05a | Rudashevskyite | (Fe,Zn)S | Iso. 43_m_ : F_43_m |
| 2.CB.05a | Stilleite | ZnSe | Iso. 43_m_ : F_43_m |
| 2.CB.05a | Ishiharaite | (Cu,Ga,Fe,In,Zn)S | Iso. 43_m_ : F_43_m |
| 2.CB.07a | Unnamed (Cu-Mn-Sn Sulphide) | Cu2MnSnS4 | |
| 2.CB.07a | Shenzhuangite | NiFeS2 | Tet. 42_m_ : I_42_d |
| 2.CB.10b | Talnakhite | Cu9(Fe,Ni)8S16 | Iso. 43_m_ : I_43_m |
| 2.CB.10b | Haycockite | Cu4Fe5S8 | Orth. 222 |
| 2.CB.10a | Lenaite | AgFeS2 | Tet. 42_m_ : I_42_d |
| 2.CB.10a | Gallite | CuGaS2 | Tet. 42_m_ : I_42_d |
| 2.CB.10a | Roquesite | CuInS2 | Tet. 42_m_ : I_42_d |
| 2.CB.10a | Eskebornite | CuFeSe2 | Tet. 42_m_ : P_42_c |
| 2.CB.10a | UM1984-30-S:CuFeSn | Cu2Fe2Sn3S7 | |
| 2.CB.10c | Omariniite | Cu8Fe2ZnGe2S12 | Orth. 222 : _I_222 |
| 2.CB.10a | Chalcopyrite | CuFeS2 | Tet. 42_m_ : I_42_d |
| 2.CB.10a | Unnamed (Cu-Zn-In Sulphide) | CuZn2InS4 | |
| 2.CB.10b | Mooihoekite | Cu9Fe9S16 | Tet. 42_m_ : P_42_m |
| 2.CB.10b | Putoranite | Cu1.1Fe1.2S2 | Iso. m_3_m _(_4/_m_32/m ) : P n_3_m |
| 2.CB.15a | Velikite | Cu2HgSnS4 | Tet. 4 : _I_4 |
| 2.CB.15c | UM2006-11-S:CuFeGeZn | Cu8(Fe,Zn)3Ge2S12 (?) | |
| 2.CB.15a | Hocartite | Ag2(Fe2+,Zn)SnS4 | Tet. 42_m_ : I_42_m |
| 2.CB.15a | Kësterite | Cu2ZnSnS4 | Tet. 4 : _I_4 |
| 2.CB.15a | Pirquitasite | Ag2ZnSnS4 | Tet. 4 : _I_4 |
| 2.CB.15a | Stannite | Cu2FeSnS4 | Tet. 42_m_ : I_42_m |
| 2.CB.15c | Stannoidite | Cu+6Cu2+2(Fe2+,Zn)3Sn2S12 | Orth. 222 : _I_222 |
| 2.CB.15b | Mohite | Cu2SnS3 | Mon. |
| 2.CB.15a | Černýite | Cu2(Cd,Zn,Fe)SnS4 | Tet. 42_m_ : I_42_m |
| 2.CB.15a | Idaite | Cu5FeS6 | Hex. |
| 2.CB.15a | Ferrokësterite | Cu2FeSnS4 | Tet. 4 : _I_4 |
| 2.CB.15a | Kuramite | Cu3SnS4 | Tet. 42_m_ : I_42_m |
| 2.CB.17a v | Arsenic-bearing Renierite | Cu11GeAsFe4S16 | |
| 2.CB.20 | Mawsonite | Cu6Fe2SnS8 | Tet. 42_m_ : _P_4_m_2 |
| 2.CB.20 | Chatkalite | Cu6FeSn2S8 | Tet. 42_m_ : _P_4_m_2 |
| 2.CB.30 | Frieseite | Ag2Fe5S8 (?) | |
| 2.CB.30 | Nekrasovite | Cu26V2(Sn,As,Sb)6S32 | Iso. 43_m_ : P_43_n |
| 2.CB.30 | Argyropyrite | near Ag2Fe7S11 | |
| 2.CB.30 | Maikainite | Cu20(Fe,Cu)6Mo2Ge6S32 | Iso. m_3_m _(_4/_m_32/m ) |
| 2.CB.30 | Colusite | Cu13VAs3S16 | Iso. 43_m_ : P_43_n |
| 2.CB.30 | Germanite | Cu13Fe2Ge2S16 | Iso. 43_m_ : P_43_n |
| 2.CB.30 | Germanocolusite | Cu26V2(Ge,As)6S32 | Iso. 43_m_ : P_43_m |
| 2.CB.30 | Stibiocolusite | Cu13V(Sb,Sn,As)3S16 | Iso. 43_m_ : P_43_m |
| 2.CB.30 | Ovamboite | Cu20(Fe,Cu,Zn)6W2Ge6S32 | Iso. 43_m_ : P_43_n |
| 2.CB.35a | Morozeviczite | (Pb,Fe)3Ge1-xS4 | Iso. |
| 2.CB.35a | Renierite | (Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 | Tet. 42_m_ : P_42_c |
| 2.CB.35a | Hemusite | Cu6SnMoS8 | Iso. |
| 2.CB.35b | Catamarcaite | Cu6GeWS8 | Hex. 6_m_ m : P_63_m c |
| 2.CB.35a | Vinciennite | Cu+7Cu2+3Fe2+2Fe3+2Sn(As,Sb)S16 | Tet. |
| 2.CB.35a | Kiddcreekite | Cu6SnWS8 | Iso. 43_m_ : F_43_m |
| 2.CB.35a | Polkovicite | (Fe,Pb)3(Ge,Fe)1-xS4 | Iso. |
| 2.CB.40 | Lautite | CuAsS | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 2.CB.42 | Lingbaoite | AgTe3 | Trig. 3_m_ : R_3_m |
| 2.CB.45 | Cadmoselite | CdSe | Hex. 6_m_ m : P_63_m c |
| 2.CB.45 | Rambergite | MnS | Hex. 6_m_ m : P_63_m c |
| 2.CB.45 | Buseckite | (Fe,Zn,Mn)S | Hex. 6_m_ m : P_63_m c |
| 2.CB.45 | Maletoyvayamite | Au3Se4Te6 | Tric. 1 : _P_1 |
| 2.CB.45 | Greenockite | CdS | Hex. 6_m_ m : P_63_m c |
| 2.CB.45 | Wurtzite | (Zn,Fe)S | Hex. 6_m_ m : P_63_m c |
| 2.CB.47 | Murchisite | Cr5S6 | Trig. 3_m_ _(_32/m ) : P_31_c |
| 2.CB.50 | Zincselenide | ZnSe | |
| 2.CB.50 | Wassonite | TiS | Trig. 3_m_ _(_32/m ) : R_3_m |
| 2.CB.52 | Dzhezkazganite | ReMoCu2PbS6 ? | Trig. 3_m_ : R_3_m |
| 2.CB.55b | Isocubanite | CuFe2S3 | Iso. m_3_m _(_4/_m_32/m ) : F m_3_m |
| 2.CB.55a | Cubanite | CuFe2S3 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 2.CB.60 | Raguinite | TlFeS2 | Orth. |
| 2.CB.60 | Picotpaulite | TlFe2S3 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 2.CB.65 | Argentopyrite | AgFe2S3 | Mon. 2/m |
| 2.CB.65 | Sternbergite | AgFe2S3 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 2.CB.70 | Sulvanite | Cu3VS4 | Iso. 43_m_ : P_43_m |
| 2.CB.75 | Vulcanite | CuTe | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 2.CB.80 | Empressite | AgTe | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 2.CB.85 | Muthmannite | AuAgTe2 | Mon. 2/m : _P_2/m |
Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for LaforêtiteHide
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References for LaforêtiteHide
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Reference List:
Meisser, Nicolas, Thelin, Philippe, Chiappero, Pierre-Jacques, Maurel, Colette (1999) Laforêtite, AgInS2, a new mineral of the chalcopyrite group from the Montgros mine, Haute-Loire, France. European Journal of Mineralogy, 11 (5) 891-898 doi:10.1127/ejm/11/5/0891
Localities for LaforêtiteHide
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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
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Egypt | |
|---|---|
| South Sinai Governorate ⓘ El Sheikh Soliman | Sallam et al. (2014) |
| France (TL) | |
| Auvergne-Rhône-Alpes Haute-Loire Brioude Pinols ⓘ Montgros Mine (TL) | Meisser et al. (1999) |
| Japan | |
| Hokkaidō Prefecture Ishikari Subprefecture Sapporo City Minami-ku ⓘ Toyoha Mine | Ishihara et al. (2011) |