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Dervillite

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Formula:
Ag
 
2
AsS
 
2
System:MonoclinicColour:Grey
Hardness:1 - 1½
Name:For Dr. Henri Derville of Strasbourg University, Strasbourg, France
This page provides mineralogical data about Dervillite.

Classification of Dervillite

IMA status:Approved
Strunz 8th edition ID:2/E.08-30
Nickel-Strunz 10th (pending) edition ID:2.LA.10

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
A : Without essential Pb
Dana 8th edition ID:3.7.17.1

3 : SULFOSALTS
7 : ø = 2
Hey's CIM Ref.: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
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Type Occurrence of Dervillite

Type Locality:Gabe Gottes Mine (incl. Giftgrube), Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France
Year of Discovery:1941
Geological Setting of type material:N1-Co-As vein.
Associated Minerals at type locality:
SaffloriteRammelsbergiteQuartzProustiteCalcite
Arsenic

Physical Properties of Dervillite

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

Crystallography of Dervillite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P2/b {P1 1 2/b} {P2/c} {P1 2/c 1}{P2/a}
Space Group Setting:P2/a
Cell Parameters:a = 6.833Å, b = 12.932Å, c = 9.638Å
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

Optical Data of Dervillite

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

Chemical Properties of Dervillite

Formula:
Ag
 
2
AsS
 
2
Essential elements:Ag, As, S
All elements listed in formula:Ag, As, S

Relationship of Dervillite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.LA.15Daomanite
CuPtAsS
 
2
2.LA.20Vaughanite
TlHgSb
 
4
S
 
7
2.LA.25Criddleite
TlAg
 
2
Au
 
3
Sb
 
10
S
 
10
2.LA.30Fettelite
[Ag
 
6
As
 
2
S
 
7
][Ag
 
10
HgAs
 
2
S
 
8
]
2.LA.35Chaméanite
(Cu,Fe)
 
4
As(Se,S)
 
4
2.LA.40Arcubisite
Ag
 
6
CuBiS
 
4
2.LA.45Mgriite
Cu
 
3
AsSe
 
3
2.LA.50Benleonardite
Ag
 
8
(Sb,As)Te
 
2
S
 
3
2.LA.55Tsnigriite
Ag
 
9
SbTe
 
3
(S,Se)
 
3
2.LA.60Borovskite
Pd
 
3
SbTe
 
4
2.LA.65Jonassonite
AuBi
 
5
S
 
4
Related Minerals - Hey's Index Grouping:

- +
3.2.1Acanthite
Ag
 
2
S
3.2.3Naumannite
Ag
 
2
Se
3.2.4Aguilarite
Ag
 
4
SeS
3.2.5Hessite
Ag
 
2
Te
3.2.6Empressite
AgTe
3.2.7Stützite
Ag
 
5-x
Te
 
3
, x = 0.24-0.36
3.2.8Cervelleite
Ag
 
4
TeS
3.2.10Stromeyerite
AgCuS
3.2.11Mckinstryite
Ag
 
5-x
Cu
 
3+x
S
 
4
3.2.12Jalpaite
Ag
 
3
CuS
 
2
3.2.13Eucairite
AgCuSe
3.2.14Cameronite
AgCu
 
7
Te
 
10
3.2.15Henryite
Ag
 
3
Cu
 
4
Te
 
4
3.2.16Sternbergite
AgFe
 
2
S
 
3
3.2.17Argentopyrite
AgFe
 
2
S
 
3
3.2.18Geffroyite
(Cu,Fe,Ag)
 
9
(Se,S)
 
8
3.2.19Argentopentlandite
Ag(Fe,Ni)
 
8
S
 
8

Other Names for Dervillite

Other Languages:
German:Dervillit
Spanish:Dervillita

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 Dervillite

Reference List:

- +
American Mineralogist (1983) 68: 1041.

Internet Links for Dervillite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Dervillite details from Handbook of Mineralogy (PDF)
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    • Localities for Dervillite

    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.
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    (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
     
    • Alsace
      • Haut-Rhin
        • Ste Marie-aux-Mines (Markirch)
    		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).
    • Auvergne
      • 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
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