Dervillite Mineral Data (original) (raw)

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

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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 - PrismaticH-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

RelativeIntensity 0% 50% 100% 150% 200% 250% 300% 350% 400% 410%
R

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:

03.07.17.01 (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

03.07.17.01 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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Print or Cut-and-Paste your Dervillite Specimen Label here :

Dervillite

Ag2AsS2
Dana No: 03.07.17.01 Strunz No: 02.LA.10
Locality:

Notes: