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Dervillite

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


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Classification of DervilliteHide

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 DervilliteHide

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

Optical Data of DervilliteHide

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

Chemical Properties of DervilliteHide

Formula:
Ag2AsS2

Crystallography of DervilliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
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 V:
839.85 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Minute crystals to 0.3mm

Type Occurrence of DervilliteHide

Other Language Names for DervilliteHide

German:Dervillit
Spanish:Dervillita

Related Minerals - Nickel-Strunz GroupingHide

2.LA.15DaomaniteCuPtAsS2Orth.
2.LA.20VaughaniteTlHgSb4S7Tric.
2.LA.25CriddleiteTlAg2Au3Sb10S10Mon.
2.LA.30Fettelite[Ag6As2S7][Ag10HgAs2S8] Mon. 2 : B2
2.LA.35Chaméanite(Cu,Fe)4As(Se,S)4Iso.
2.LA.40ArcubisiteAg6CuBiS4
2.LA.45MgriiteCu3AsSe3
2.LA.50Benleonardite[Ag6(Sb,As)2S6Te] [Ag9Cu(S,Te)2Te2]Trig. 3m (3 2/m) : P3m1
2.LA.55TsnigriiteAg9SbTe3(S,Se)3Mon.
2.LA.60BorovskitePd3SbTe4Iso.
2.LA.65JonassoniteAuBi5S4Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.2.1AcanthiteAg2SMon. 2/m : P21/m
3.2.3NaumanniteAg2SeOrth. 2 2 2 : P21 21 21
3.2.4AguilariteAg4SeSMon. 2/m
3.2.5HessiteAg2TeMon. 2/m : P21/b
3.2.6EmpressiteAgTeOrth. mmm (2/m 2/m 2/m)
3.2.7StütziteAg5-xTe3, x = 0.24-0.36Hex.
3.2.8CervelleiteAg4TeSMon. 2/m
3.2.10StromeyeriteAgCuSOrth. mmm (2/m 2/m 2/m)
3.2.11MckinstryiteAg5-xCu3+xS4Orth. mmm (2/m 2/m 2/m) : Pnma
3.2.12JalpaiteAg3CuS2Tet.
3.2.13EucairiteAgCuSeOrth.
3.2.14CameroniteCu5-x(Cu,Ag)3+xTe10 (x = 0.43)Mon. 2/m : B2/b
3.2.15Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40 Iso. m3m (4/m 3 2/m) : Fd3c
3.2.16SternbergiteAgFe2S3Orth. mmm (2/m 2/m 2/m)
3.2.17ArgentopyriteAgFe2S3Mon. 2/m
3.2.18Geffroyite(Cu,Fe,Ag)9(Se,S)8Iso. m3m (4/m 3 2/m) : Fm3m
3.2.19ArgentopentlanditeAg(Fe,Ni)8S8Iso. m3m (4/m 3 2/m) : Fm3m

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 DervilliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1983) 68: 1041.

Internet Links for DervilliteHide

Localities for DervilliteHide

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.
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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