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Laffittite

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About LaffittiteHide

00108500014946713895359.jpg
Pierre Laffitte (1925 - )
Formula:
AgHgAsS3
Colour:
Dark red to cherry-red
Lustre:
Adamantine, Metallic
Hardness:
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.
As analogue of UM1993-09-S:AgHgSb.


Classification of LaffittiteHide

Approved
First Published:
1974
2.GA.35

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
3.4.10.2

3 : SULFOSALTS
4 : ø = 3
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

Physical Properties of LaffittiteHide

Adamantine, Metallic
Transparency:
Opaque
Colour:
Dark red to cherry-red
Streak:
Pale cherry-red to brownish red
Hardness:
3½ on Mohs scale
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 LaffittiteHide

Type:
Anisotropic
Anisotropism:
Strong to moderate, pale gray-blue to dark gray
Reflectivity:
400nmR1=34.5%R2=38.4%
420nmR1=34.6%R2=37.7%
440nmR1=34.7%R2=37.0%
460nmR1=34.4%R2=36.1%
480nmR1=33.8%R2=35.2%
500nmR1=32.9%R2=34.3%
520nmR1=31.8%R2=33.4%
540nmR1=30.7%R2=32.5%
560nmR1=29.5%R2=31.7%
580nmR1=28.6%R2=30.8%
600nmR1=28.0%R2=30.1%
620nmR1=27.4%R2=29.7%
640nmR1=27.1%R2=29.4%
660nmR1=26.8%R2=29.4%
680nmR1=26.6%R2=29.2%
700nmR1=26.3%R2=28.9%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 38.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Bluish white
Internal Reflections:
Purple-red
Pleochroism:
Strong

Chemical Properties of LaffittiteHide

Formula:
AgHgAsS3

Crystallography of LaffittiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 7.73 Å, b = 11.28 Å, c = 6.64 Å
β = 115.16°
Ratio:
a:b:c = 0.685 : 1 : 0.589
Unit Cell V:
524.04 ų (Calculated from Unit Cell)
Z:
4
Twinning:
{100}, twin axis ⊥ {100}; also by an unknown law giving intergrowths at a 60 degree angle

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.682 Å(100)
3.198 Å(80)
3.005 Å(80)
3.505 Å(70)
2.133 Å(60)
5.31 Å(50)
1.905 Å(50)

Type Occurrence of LaffittiteHide

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:
Reference:
Johan, Z., Mantienne, J., Picot, R. (1974) La routhiérite, TlHgAsS3, et la laffittite, AgHgAsS3, deux nouvelles espèces minérales. Bulletin de la Société Française de Minéralogie et de Cristallographie: 97: 48-53.

Synonyms of LaffittiteHide

Other Language Names for LaffittiteHide

German:Laffittit
Spanish:Laffittita

Common AssociatesHide

Associated Minerals Based on Photo Data:
8 photos of Laffittite associated with OrpimentAs2S3
7 photos of Laffittite associated with RealgarAs4S4
4 photos of Laffittite associated with GetchelliteAsSbS3
3 photos of Laffittite associated with QuartzSiO2
2 photos of Laffittite associated with StibniteSb2S3
2 photos of Laffittite associated with RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6
2 photos of Laffittite associated with CalciteCaCO3
1 photo of Laffittite associated with CinnabarHgS
1 photo of Laffittite associated with PierrotiteTl2(Sb,As)10S16

Related Minerals - Nickel-Strunz GroupingHide

2.GA.05ProustiteAg3AsS3Trig. 3m (3 2/m) : R3c
2.GA.05PyrargyriteAg3SbS3Trig. 3m : R3c
2.GA.10PyrostilpniteAg3SbS3Mon. 2/m : P21/b
2.GA.10XanthoconiteAg3AsS3Mon. 2/m : B2/b
2.GA.15SamsoniteAg4MnSb2S6Mon. 2/m : P21/m
2.GA.20SkinneriteCu3SbS3Mon. 2/m : P21/b
2.GA.20WitticheniteCu3BiS3Orth. 2 2 2 : P21 21 21
2.GA.25LapieiteNiCuSbS3Orth.
2.GA.25MückeiteNiCu(Bi,Sb)S3Orth. 2 2 2 : P21 21 21
2.GA.25MalyshevitePdCuBiS3Orth. mmm (2/m 2/m 2/m) : Pmmm
2.GA.25LisiguangitePtCuBiS3Orth. 2 2 2 : P21 21 21
2.GA.30AktashiteCu6Hg3As4S12Trig. 3 : R3
2.GA.30GruzdeviteCu6Hg3Sb4S12Trig.
2.GA.30NowackiiteCu6Zn3As4S12Trig. 3 : R3
2.GA.40RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet. 4 2m : I4 2m
2.GA.40StalderiteTl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6Tet.
2.GA.45ErniggliiteTl2SnAs2S6Trig. 3 : P3
2.GA.50BournonitePbCuSbS3Orth. mm2 : Pmn21
2.GA.50SeligmannitePbCuAsS3Orth. mmm (2/m 2/m 2/m) : Pmmn
2.GA.50SoučekitePbCuBi(S,Se)3Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

3.4.10.1ChristiteTlHgAsS3Mon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

5.4.1NowackiiteCu6Zn3As4S12Trig. 3 : R3
5.4.2Florensovite(Cu,Zn)Cr1.5Sb0.5S4Iso. m3m (4/m 3 2/m)
5.4.3AktashiteCu6Hg3As4S12Trig. 3 : R3
5.4.5Galkhaite(Cs,Tl)(Hg,Cu,Zn)6(As,Sb)4S12Iso. 4 3m : I4 3m
5.4.6LivingstoniteHgSb4S6(S2)Mon. 2/m : B2/b
5.4.7GruzdeviteCu6Hg3Sb4S12Trig.
5.4.8TvalchrelidzeiteHg3SbAsS3Mon. 2/m
5.4.9Hakite-(Hg)Cu6Cu4Hg2Sb4Se12SeIso. 4 3m : I4 3m

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 LaffittiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Johan, Z., Mantienne, J., Picot, R. (1974) La routhiérite, TlHgAsS3, et la laffittite, AgHgAsS3, deux nouvelles espèces minérales. Bulletin de la Société Française de Minéralogie et de Cristallographie: 97: 48-53.
Fleischer, M., Mandarino, J.A. (1975) New mineral names. American Mineralogist: 60: 945-947.
Il'yasheva, N.A., Godovikov, A.A., Nenashev, B.G., Popov, S.P. (1979) Synthese de la laffittite AgHgAsS3. Doklady Akademii Nauk SSSR: 15(10): 1748-1751.
Nakai, I. Appleman, D.E. (1983) Laffitite, AgHgAsS3, crystal structure & second occurrence from the Getchell Mine, Nevada. American Mineralogist: 68: 235-244.
Borisov, S.V., Magarill, S.A., Pervukhina, N.V. (2009) Characteristic features of crystal chemistry of natural mercury-containing sulfides and sulfosalts. Journal of Structural Chemistry: 50: 853-860.
Pervukhina, N.V., Borisov, S.V., Magarill, S.A., Vasil'ev, V.I., Kuratieva, N.V. (2010) Redetermination and crystallographic analysis of the structure of Sb-containing laffittite AgHg(As,Sb)S3 from Chauvai (Kyrgyzstan). Journal of Structural Chemistry: 51: 683-688.
Biagioni, C., Bonaccorsi, E., Moëlo, Y., Orlandi, P. (2014) Mercury-arsenic sulfosalts from Apuan Alps (Tuscany, Italy). II. Aktashite, Cu6Hg3As4S12, and laffittite, AgHgAsS3, from the Monte Arsiccio mine: occurrence and crystal structure. Periodico di Mineralogia: 83: 1-18.

Internet Links for LaffittiteHide

Localities for LaffittiteHide

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.
France (TL)
 
  • Provence-Alpes-Côte d'Azur
    • Hautes-Alpes
      • La Chapelle-en-Valgaudemar (La Chapelle-en-Valgaudémar)
Bull.Soc.fr.Min.Crist.(1974) 97, 48-53; Johan, Z. & Mantienne, J. (2000): Thallium-rich mineralization at Jas Roux, Hautes-Alpes, France: a complex epithermal, sediment-hosted, ore-forming system. J. Czech Geol. Soc. 45, 63-77.
Italy
 
  • Tuscany
    • Lucca Province
      • Stazzema
        • Sant'Anna di Stazzema
Biagioni, C., Bonaccorsi, E., Moëlo, Y., Orlandi, P. (2014): Mercury-arsenic sulfosalts from Apuan Alps (Tuscany, Italy). II. Aktashite, Cu6Hg3As4S12, and laffittite, AgHgAsS3, from the Monte Arsiccio mine: occurrence and crystal structure. Periodico di Mineralogia, 83, 1-18.
Kyrgyzstan
 
  • Osh Region
[Lapis 1993:11 p11-24]; Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30; Pervukhina, N. V., Borisov, S. V., Magarill, S. A., Vasil’ev, V. I., & Kuratieva, N. V. (2010). Redetermination and Crystallographic Analysis of the Structure of Sb-Containing Laffittite AgHg (As, Sb) S 3 From Chauvai (Kyrgyzstan). Journal of Structural Chemistry, 51(4), 683-688.
USA
 
  • Nevada
    • Humboldt Co.
      • Osgood Mountains
        • Potosi Mining District
          • Adam Peak
NBMG Spec. Pub. 31 Minerals of Nevada; Nakai,I. & Appleman, D.E. (1983): Laffitite, AgHgAsS3, crystal structure & second occurrence from the Getchell Mine, Nevada, American Mineralogist, 68: 235-244
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia
 
Mineral and/or Locality  
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