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Laffittite

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Getchell Mine, Adam Peak, Potosi District, Humboldt Co., Nevada, USA
© Thomas Witzke

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Formula:
AgHgAsS
 
3
System:MonoclinicHardness:3½
This page provides mineralogical data about Laffittite.

Classification of Laffittite

IMA status:Approved
Strunz 8th edition ID:2/E.12-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID: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
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Type Occurrence of Laffittite

Type Locality:Jas Roux, Pelvoux Mt., Valgaudemar, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France
Year of Discovery:1974

Physical Properties of Laffittite

Hardness (Mohs):3½

Crystallography of Laffittite

Crystal System:Monoclinic
Cell Parameters:a = 7.73Å, b = 11.28Å, c = 6.64Å
β = 115.16°
Ratio:a:b:c = 0.685 : 1 : 0.589
Unit Cell Volume:V 524.04 ų (Calculated from Unit Cell)

Chemical Properties of Laffittite

Formula:
AgHgAsS
 
3
Essential elements:Ag, As, Hg, S
All elements listed in formula:Ag, As, Hg, S

Relationship of Laffittite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.GA.05Proustite
Ag
 
3
AsS
 
3
2.GA.05Pyrargyrite
Ag
 
3
SbS
 
3
2.GA.10Pyrostilpnite
Ag
 
3
SbS
 
3
2.GA.10Xanthoconite
Ag
 
3
AsS
 
3
2.GA.15Samsonite
Ag
 
4
MnSb
 
2
S
 
6
2.GA.20Skinnerite
Cu
 
3
SbS
 
3
2.GA.20Wittichenite
Cu
 
3
BiS
 
3
2.GA.25Lapieite
NiCuSbS
 
3
2.GA.25Mückeite
NiCu(Bi,Sb)S
 
3
2.GA.25Malyshevite
PdCuBiS
 
3
2.GA.25Lisiguangite
PtCuBiS
 
3
2.GA.30Aktashite
Cu
 
6
Hg
 
3
As
 
4
S
 
12
2.GA.30Gruzdevite
Cu
 
6
Hg
 
3
Sb
 
4
S
 
12
2.GA.30Nowackiite
Cu
 
6
Zn
 
3
As
 
4
S
 
12
2.GA.40Routhierite
Tl(Cu,Ag)(Hg,Zn)
 
2
(As,Sb)
 
2
S
 
6
2.GA.40Stalderite
Tl(Cu,Ag)(Zn,Fe,Hg)
 
2
(As,Sb)
 
2
S
 
6
2.GA.45Erniggliite
Tl
 
2
SnAs
 
2
S
 
6
2.GA.50Bournonite
PbCuSbS
 
3
2.GA.50Seligmannite
PbCuAsS
 
3
2.GA.50Součekite
PbCuBi(S,Se)
 
3
Related Minerals - Hey's Index Grouping:

- +
5.4.1Nowackiite
Cu
 
6
Zn
 
3
As
 
4
S
 
12
5.4.2Florensovite
(Cu,Zn)Cr
 
1.5
Sb
 
0.5
S
 
4
5.4.3Aktashite
Cu
 
6
Hg
 
3
As
 
4
S
 
12
5.4.5Galkhaite
(Cs,Tl)(Hg,Cu,Zn)
 
6
(As,Sb)
 
4
S
 
12
5.4.6Livingstonite
HgSb
 
4
S
 
8
5.4.7Gruzdevite
Cu
 
6
Hg
 
3
Sb
 
4
S
 
12
5.4.8Tvalchrelidzeite
Hg
 
3
SbAsS
 
3
5.4.9Hakite
(Cu,Hg,Ag)
 
12
Sb
 
4
(Se,S)
 
13

Other Names for Laffittite

Synonyms:
IMA1973-031
Other Languages:
German:Laffittit
Russian:Лафитит
Spanish:Laffittita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Laffittite

Reference List:

- +
- American Mineralogist (1975): 60: 945-946.

- Nakai,I. & Appleman, D.E. (1983): Laffitite, AgHgAsS3, crystal structure & second occurrence from the Getchell Mine, Nevada. American Mineralogist, 68: 235-244

Internet Links for Laffittite

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    • Localities for Laffittite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • Provence-Alpes-Côte d'Azur
      • Hautes-Alpes
        • Valgaudemar
          • Pelvoux Mt.
    		Bull.Soc.fr.Min.Crist.(1974) 97, 48-53
    Kyrgyzstan
     
    • Osh Oblast
      • Alai (Alay) Range
    		[Lapis 1993:11 p11-24]
    USA
     
    • Nevada
      • Humboldt Co.
        • Potosi 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
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