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Dervillite

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Formula:
Ag2AsS2
System:
Monoclinic
Colour:
Grey
Lustre:
Metallic
Hardness:
1 - 1½
Name:
For Dr. Henri Derville of Strasbourg University, Strasbourg, France.
This page provides mineralogical data about Dervillite.


Classification of Dervillite

Approved, 'Grandfathered' (first described prior to 1959)
2.LA.10

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
3.7.17.1

3 : SULFOSALTS
7 : ø = 2
3.2.9

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
2 : Sulphides etc. of Ag

Physical Properties of Dervillite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Grey
Hardness (Mohs):
1 - 1½
Hardness (Vickers):
VHN10=19.5 kg/mm2
Density:
5.62 g/cm3 (Calculated)

Optical Data of Dervillite

Type:
Anisotropic
Anisotropism:
Moderate
Colour in reflected light:
White

Chemical Properties of Dervillite

Formula:
Ag2AsS2
Elements listed in formula:

Crystallography of Dervillite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Space Group Setting:
P2/a
Cell Parameters:
a = 6.833 Å, b = 12.932 Å, c = 9.638 Å
β = 99.55°
Ratio:
a:b:c = 0.528 : 1 : 0.745
Unit Cell Volume:
V 839.85 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Minute crystals to 0.3mm

Type Occurrence of Dervillite

Geological Setting of Type Material:
Ni-Co-As vein.
Associated Minerals at Type Locality:

Relationship of Dervillite to other Species

2.LA.15DaomaniteCuPtAsS2
2.LA.20VaughaniteTlHgSb4S7
2.LA.25CriddleiteAg2Au3TlSb10S10
2.LA.30Fettelite[Ag6As2S7][Ag10HgAs2S8]
2.LA.35Chaméanite(Cu,Fe)4As(Se,S)4
2.LA.40ArcubisiteAg6CuBiS4
2.LA.45Mgriite(Cu,Fe)3AsSe3
2.LA.50BenleonarditeAg15Cu(Sb,As)2S7Te4
2.LA.55TsnigriiteAg9SbTe3S3
2.LA.60BorovskitePd3SbTe4
2.LA.65JonassoniteAu(Bi,Pb)5S4
3.2.1AcanthiteAg2S
3.2.3NaumanniteAg2Se
3.2.4AguilariteAg4SeS
3.2.5HessiteAg2Te
3.2.6EmpressiteAgTe
3.2.7StütziteAg5-xTe3 (x = 0.24-0.36)
3.2.8CervelleiteAg4TeS
3.2.10StromeyeriteCuAgS
3.2.11MckinstryiteAg5Cu3S4
3.2.12JalpaiteAg3CuS2
3.2.13EucairiteCuAgSe
3.2.14CameroniteCu5-x(Cu,Ag)3+xTe10 (x = 0.43)
3.2.15HenryiteCu4Ag3Te4
3.2.16SternbergiteAgFe2S3
3.2.17ArgentopyriteAgFe2S3
3.2.18Geffroyite(Cu,Fe,Ag)9Se8
3.2.19ArgentopentlanditeAg(Fe,Ni)8S8

Other Names for Dervillite

Name in Other Languages:
German:Dervillit
Spanish:Dervillita

Other Information

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 Dervillite

Reference List:
American Mineralogist (1983) 68: 1041.

Internet Links for Dervillite

mindat.org URL:
https://www.mindat.org/min-1265.html
Please feel free to link to this page.

Localities for Dervillite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Australia
 
  • New South Wales
    • Robinson Co.
      • Cobar
Leverett, P., McKinnon, A. R., & Williams, P. A. (2005). Supergene geochemistry of the Endeavor ore body, Cobar, NSW, and relationships to other deposits in the Cobar basin. Regolith 2005–Ten Years of CRC LEME, 191-194.
France
 
  • Auvergne-Rhône-Alpes
    • Haute-Loire
      • La Chaise-Dieu
        • Saint-Pal-de-Senouire
P.G. Pélisson : "Etude Minéralogique et Métallogénique du District Filonien Polytype de Paulhaguet (Haute-Loire, Massif Central Français)", Doctorate Thesis, Orléans, France, 1989
  • Grand Est
    • Haut-Rhin
      • Ste Marie-aux-Mines (Markirch)
P&T N°23-24, H. BARI 1982, Minéralogie des filons du Neuenberg à Sainte Marie aux Mines (Haut-Rhin).
          • Sankt Jakob vein
H. Bari (1982) Dervillite Ag2AsS2, monoclinic, new definition of the species described by Weil, 1941. Pierres et Terre, No. 23-24,62-67 (in French).
Switzerland
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Bindi L., Nestola F., De Battisti L., Guastoni A. (2013): Dervillite, Ag2AsS2, from Lengenbach quarry, Binn valley, Switzerland: occurrence and crystal structure. Mineralogical Magazine 77(8), 3105-3112. (see also http://fglb.clubdesk.ch/clubdesk/www)
Mineral and/or Locality  
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