Mineralogy Database

Laffittite Mineral Data

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General Laffittite Information

Help on Chemical  Formula: Chemical Formula: AgHgAsS3
Help on Composition: Composition: Molecular Weight = 479.58 gm
   Silver   22.49 %  Ag
   Mercury  41.83 %  Hg
   Arsenic  15.62 %  As
   Sulfur   20.06 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: AgHgAsS3
Help on Environment: Environment: In a hydrothermal deposit with other arsenic sulfides.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Jas Roux, Valgaudemar, Hautes-Alpes, Provence-Alpes-C�te d'Azur, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pierre Laffitte, Director, National School of Mines, Paris, France.
Help on Name Pronunciation: Name Pronunciation: Laffittite + Pronunciation Say LAFFITTITE
Help on Synonym: Synonym: ICSD 31194
  PDF 35-436

Laffittite Image

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Comments: A short-prismatic, dark brown crystal of laffittite with red realgar and yellow orpiment.
Location: Getchell Mine, Adam Peak, Humboldt Co., Nevada, USA. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Laffittite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6851:1:0.5886
Help on Cell Dimensions: Cell Dimensions: a = 7.732, b = 11.285, c = 6.643, Z = 4; beta = 115.16° V = 524.65 Den(Calc)= 6.07
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Aa
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.512(1), 3.202(0.78), 3.015(0.69),

Physical Properties of Laffittite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Dark red.
Help on Density: Density: 6.07
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic
Help on Streak: Streak: brownish red

Optical Properties of Laffittite

Help on RL Anisotrophism: RL Anisotrophism: Strong, from light gray-blue to dark gray.
Help on RL Color: RL Color: Bluish white with numerous purple-red internal reflections.
Help on RL Pleochroism: RL Pleochroism: Strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Laffittite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   34.50   38.40 
 420 nm   34.60   37.70 
 440 nm   34.70   37.00 
 460 nm   34.40   36.10 
 480 nm   33.80   35.20 
 500 nm   32.90   34.30 
 520 nm   31.80   33.40 
 540 nm   30.70   32.50 
 560 nm   29.50   31.70 
 580 nm   28.60   30.80 
 600 nm   28.00   30.10 
 620 nm   27.40   29.70 
 640 nm   27.10   29.40 
 660 nm   26.80   29.40 
 680 nm   26.60   29.20 
 700 nm   26.30   28.90 
Calculated Relative Intensity Colors of Laffittite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 310%

Calculated Properties of Laffittite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.27 gm/cc
note: Specific Gravity of Laffittite =6.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PELaffittite = 754.44 barns/electron
U=PELaffittite x rElectron Density=3,972.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laffittite is Not Radioactive

Laffittite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.04)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.04.10)Dana Group Christite TlHgAsS3 P 21/n 2/m Laffittite AgHgAsS3 Aa m IMA2007-010! PbHgAs2S6 P lattice Mono
Help on  Strunz Class: Strunz Class: 02.GA.35 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GA -Neso-sulfarsenites, etc., without additional S
02.GA.35 Laffittite AgHgAsS3 Aa m

Other Laffittite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Laffittite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.GA.35





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