Laffittite Mineral Data (original) (raw)
General Laffittite Information
Chemical Formula:
AgHgAsS3
Composition:
Molecular Weight = 479.58 gm
Silver 22.49 % Ag
Mercury 41.83 % Hg
Arsenic 15.62 % As
Sulfur 20.06 % S
______
100.00 %
Empirical Formula:
AgHgAsS3
Environment:
In a hydrothermal deposit with other arsenic sulfides.
IMA Status:
Approved IMA 1974
Locality:
Jas Roux, Valgaudemar, Hautes-Alpes, Provence-Alpes-C�te d'Azur, France. Link to MinDat.org Location Data.
Name Origin:
Named for Pierre Laffitte, Director, National School of Mines, Paris, France.
Name Pronunciation:
Laffittite + Pronunciation 
Synonym:
ICSD 31194
PDF 35-436
Laffittite Image
Images:
 |
Laffittite 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
Axial Ratios:
a:b:c =0.6851:1:0.5886
Cell Dimensions:
a = 7.732, b = 11.285, c = 6.643, Z = 4; beta = 115.16° V = 524.65 Den(Calc)= 6.07
Crystal System:
Monoclinic - DomaticH-M Symbol (m) Space Group: Aa
X Ray Diffraction:
By Intensity(I/Io): 3.512(1), 3.202(0.78), 3.015(0.69),
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
| | Nakai I , Appleman D E , American Mineralogist , 68 (1983) p.235-244, Laffittite, AgHgAsS3: crystal structure and second occurrence from the, Getchell mine, Nevada | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Laffittite
Cleavage:
{???} Indistinct
Color:
Dark red.
Density:
6.07
Diaphaneity:
Translucent to Opaque
Hardness:
3.5 - Copper Penny
Luster:
Metallic
Streak:
brownish red
Optical Properties of Laffittite
RL Anisotrophism:
Strong, from light gray-blue to dark gray.
RL Color:
Bluish white with numerous purple-red internal reflections.
RL Pleochroism:
Strong.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Laffittite in Air
| λ | R1 | R 2 |  |
∑ 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
| RelativeIntensity | 0% | 40% | 80% | 100% | 120% | 160% | 200% | 240% | 280% | 310% |
|---|---|---|---|---|---|---|---|---|---|---|
| R1 | ||||||||||
| R2 |
Calculated Properties of Laffittite
Electron Density:
Bulk Density (Electron Density)=5.27 gm/cc
note: Specific Gravity of Laffittite =6.07 gm/cc.
Fermion Index:
Fermion Index = 0.12
Boson Index = 0.88
Photoelectric:
PELaffittite = 754.44 barns/electron
U=PELaffittite x rElectron Density=3,972.33 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laffittite is Not Radioactive
Laffittite Classification
Dana Class:
03.04.10.02 (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
03.04.10.01 Christite TlHgAsS3 P 21/n 2/m
03.04.10.02 Laffittite AgHgAsS3 Aa m
03.04.10.03 IMA2007-010! PbHgAs2S6 P lattice Mono
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
References:
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
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
15 - WWW-MINCRYST
Search for Laffittite using:
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]
Visit our Advertisers for Laffittite :
A Bijoux Google Search for Laffittite
Adam's Minerals Google Search for Laffittite
Cape Minerals Google Search for Laffittite
Dakota Matrix Minerals Google Search for Laffittite
Excalibur Mineral Corp. Google Search for Laffittite
Exceptional Minerals Google Search for Laffittite
John Betts Fine Minerals Search for Laffittite
McDougall Minerals Google Search for Laffittite
Mineral News Website Link
Rock and Mineral Shows Google Search for Laffittite
Weinrich Minerals, Inc. Google Search for Laffittite
Ask about Laffittite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol
Print or Cut-and-Paste your Laffittite Specimen Label here :
Laffittite
AgHgAsS3
Dana No: 03.04.10.02 Strunz No: 02.GA.35
Locality:
Notes: