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Laffittite

A valid IMA mineral species
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AgHgAsS3
Colour:
Dark red to cherry-red, may be very dark-red with only red glints
Lustre:
Adamantine, Metallic
Hardness:
3½
Specific Gravity:
6.11
Crystal System:
Monoclinic
Name:
Named in 1974 by Zdeněk Johan, Joseph Mantienne, and R. Picot in honor of Pierre Paul Laffitte (January 1, 1925 Saint-Paul-de-Vence, Alpes-Maritimes, France - ), director of BRGM (French Geological Survey), then director and president of Ecole Nationale Supérieure des Mines de Paris.
Type Locality:
ⓘJas Roux, La Chapelle-en-Valgaudemar, Gap, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France
As analogue ofUM1993-09-S:AgHgSb.


Unique Identifiers
First published:
1974
Type description reference:
Johan, Zdenek, Mantienne, Joseph, Picot, Paul (1974) La routhiérite, TlHgAsS3, et la laffittite, AgHgAsS3, deux nouvelles espèces minérales.Bulletin de Minéralogie, 97 (1) 48-53doi:10.3406/bulmi.1974.6914

Classification of Laffittite

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
A : Neso-sulfarsenites, etc. without additional S
Dana 8th ed.:
3.4.10.2

3 : SULFOSALTS
4 : ø = 3
Hey's CIM Ref.:
5.4.4

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
4 : Sulpharsenites etc. of Zn and Hg

Mineral Symbols
Transparency:
Opaque
Colour:
Dark red to cherry-red, may be very dark-red with only red glints
Streak:
Pale cherry-red to brownish red
Hardness:
3½ onMohs scale
Hardness:
VHN25=92 - 138 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good to imperfect on {010}
Fracture:
Conchoidal
Density:
6.11 g/cm3 (Measured)    6.195 g/cm3 (Calculated)
Comment:
Measured is on synthetic material

Optical Data of Laffittite

Crystallography of Laffittite
General Appearance of Type Material:
Grains up to 0.2 mm
Place of Conservation of Type Material:
National School of Mines, Paris, France.
Geological Setting of Type Material:
Dolomitic rocks
Associated Minerals at Type Locality:
PierrotitePyriteRealgarRouthieriteSmithite
SphaleriteStibnite
Reference:
Johan, Zdenek, Mantienne, Joseph, Picot, Paul (1974) La routhiérite, TlHgAsS3, et la laffittite, AgHgAsS3, deux nouvelles espèces minérales.Bulletin de Minéralogie, 97 (1) 48-53doi:10.3406/bulmi.1974.6914

Synonyms of Laffittite

Other Language Names for Laffittite

Common AssociatesMon. 2/m2.GA.ArsiccioiteAgHg2Tl(As,Sb)2S6Tet.42m :I42m2.GA.EckeriteAg2CuAsS3Mon. 2/m :B2/b2.GA.05ProustiteAg3AsS3Trig.3m(32/m) :R3c2.GA.05PyrargyriteAg3SbS3Trig. 3m :R3c2.GA.10XanthoconiteAg3AsS3Mon. 2/m :B2/b2.GA.10PyrostilpniteAg3SbS3Mon. 2/m :P21/b2.GA.15SamsoniteAg4MnSb2S6Mon. 2/m :P21/m2.GA.20BytíziteCu3SbSe3Orth.mmm(2/m2/m2/m) :Pnma2.GA.20SkinneriteCu3SbS3Mon. 2/m :P21/b2.GA.20WitticheniteCu3BiS3Orth. 222 :P2121212.GA.25LapieiteNiCuSbS3Orth. 222 :P2121212.GA.25LisiguangitePtCuBiS3Orth. 222 :P2121212.GA.25MalyshevitePdCuBiS3Orth.mmm(2/m2/m2/m) :Pmmm2.GA.25RoterbäritePdBiCuSe3Orth. 222 :P2121212.GA.25MückeiteNiCu(Bi,Sb)S3Orth. 222 :P2121212.GA.30AktashiteCu6Hg3As4S12Trig. 3 :R32.GA.30NowackiiteCu6Zn3As4S12Trig. 3 :R32.GA.30ZhengminghuaiteCu6Fe3As4S12Trig. 3 :R32.GA.30GruzdeviteCu6Hg3Sb4S12Trig. 3 :R32.GA.40Unnamed (Ag-Fe endmember of Routhierite Group)AgFe2TlAs2S62.GA.40RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet.42m :I42m2.GA.40StalderiteTl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6Tet.42m :I42m2.GA.40RalphcannoniteAgZn2TlAs2S6Tet.42m :I42m2.GA.40FerrostalderiteCuFe2TlAs2S6Tet.42m :I42m2.GA.45ErniggliiteTl2SnAs2S6Trig.3 :P32.GA.50CerromojoniteCuPbBiSe3Orth.2.GA.50SeligmannitePbCuAsS3Orth.mmm(2/m2/m2/m) :Pmmn2.GA.50SoučekitePbCuBi(S,Se)3Orth.mm22.GA.50Unnamed (Pb-Cu-Bi Selenide)PbCuBiSe32.GA.50BournonitePbCuSbS3Orth.mm2 :Pmn212.GA.55EldragóniteCu6BiSe4(Se2)Orth.mmm(2/m2/m2/m)

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    • References for Laffittite
      • Hautes-Alpes
        • Gap
          • La Chapelle-en-Valgaudemar
    Johan et al. (1974)+1 other reference
    Italy
     
    Biagioni et al. (2014)
    Kyrgyzstan
     
    Kolesar et al. (1993)+2 other references
    Russia
     
    Stepanov+9 other references
    USA
     
    Nakai et al. (1983)+1 other reference- (2005)- (2005)- (2005)- (2005)
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