Mineralogy Database

Dervillite Mineral Data

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General Dervillite Information

Help on Chemical  Formula: Chemical Formula: Ag2AsS2
Help on Composition: Composition: Molecular Weight = 354.79 gm
   Silver   60.81 %  Ag
   Arsenic  21.12 %  As
   Sulfur   18.08 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Ag2AsS2
Help on Environment: Environment: In a Co-Ni-Fe-As deposit.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1941
Help on Locality: Locality: Found on a museum specimen from the Gabe-Gottes mine, Sainte-Marie-aux-Mies, Haut-Rhin, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Dr. Henri Derville of Strasbourg University, Strasbourg, France.
Help on Name Pronunciation: Name Pronunciation: Dervillite + Pronunciation Say DERVILLITE

Dervillite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5283:1:0.7452
Help on Cell Dimensions: Cell Dimensions: a = 6.833, b = 12.932, c = 9.638, Z = 4; beta = 99.53° V = 839.90 Den(Calc)= 2.81
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.075(1), 3.019(0.8), 2.843(0.5),

Physical Properties of Dervillite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Brownish black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 1-1.5 - Talc or a little harder
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Dervillite

Help on RL Anisotrophism: RL Anisotrophism: Moderate.
Help on RL Color: RL Color: White.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Dervillite in Air
λ R  ∑ R(λ) 
 400 nm   29.70   
 420 nm   25.60 
 440 nm   24.90 
 460 nm   24.20 
 480 nm   23.70 
 500 nm   23.50 
 520 nm   23.10 
 540 nm   22.20 
 560 nm   22.20 
 580 nm   21.90 
 600 nm   21.50 
 620 nm   21.20 
 640 nm   20.90 
 660 nm   20.60 
 680 nm   20.40 
 700 nm   20.40 
Calculated Relative Intensity Colors of Dervillite in Air
   0%   50% 100% 150% 200% 250% 300% 350% 400% 410%

Calculated Properties of Dervillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Dervillite =2.81 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013557034
Boson Index = 0.9986442966
Help on Photoelectric: Photoelectric: PEDervillite = 170.89 barns/electron
U=PEDervillite x rElectron Density= 430.40 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dervillite is Not Radioactive

Dervillite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.17)Dana Group Dervillite Ag2AsS2 P 2/a 2/m
Help on  Strunz Class: Strunz Class: 02.LA.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.L - Unclassified Sulfosalts
  02.LA -Without essential Pb
02.LA.10 Dervillite Ag2AsS2 P 2/a 2/m

Other Dervillite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Dervillite :
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

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Dana No: Strunz No: 02.LA.10





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