Mineralogy Database

Domeykite Mineral Data

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General Domeykite Information

Help on Chemical  Formula: Chemical Formula: Cu3As
Help on Composition: Composition: Molecular Weight = 265.56 gm
   Copper   71.79 %  Cu
   Arsenic  28.21 %  As
           100.00 % 
Help on Empirical Formula: Empirical Formula: Cu3As
Help on Environment: Environment: Of hydrothermal origin.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Algodones mines, Coquimbo, Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Chilean mineralogist, I. Domeyk (1802-1889).
Help on Name Pronunciation: Name Pronunciation: Domeykite + Pronunciation Say DOMEYKITE
Help on Synonym: Synonym: ICSD 100149
  PDF 44-1475

Domeykite Image

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Comments: Metallic nugget of domeykite.
Location: Cashin Mine, Montrose County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Domeykite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 9.611, Z = 16; V = 887.78 Den(Calc)= 7.95
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43d
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.05(1), 1.888(0.7), 1.965(0.5),

Physical Properties of Domeykite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray, Yellow brown, Silver white, Tin white.
Help on Density: Density: 7.2 - 8.1, Average = 7.65
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Help on Habit: Habit: Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: black gray

Optical Properties of Domeykite

Help on RL Color: RL Color: Tin white to steel gray, tarnishes yellowish, then to brownish, and finally to iridescence.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Domeykite in Air
λ R  ∑ R(λ) 
 400 nm   43.60   
 420 nm   45.00 
 440 nm   46.40 
 460 nm   47.80 
 480 nm   49.00 
 500 nm   50.10 
 520 nm   51.00 
 540 nm   51.90 
 560 nm   52.70 
 580 nm   53.20 
 600 nm   53.50 
 620 nm   53.60 
 640 nm   53.70 
 660 nm   53.70 
 680 nm   53.60 
 700 nm   53.60 
Calculated Relative Intensity Colors of Domeykite in Air
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%

Calculated Properties of Domeykite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.18 gm/cc
note: Specific Gravity of Domeykite =7.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0
Boson Index = 1
Help on Photoelectric: Photoelectric: PEDomeykite = 53.47 barns/electron
U=PEDomeykite x rElectron Density= 384.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Domeykite is Not Radioactive

Domeykite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.02)where Am Bn Xp, with (m+n):p=3:1
  (02.02.02)Domeykite Group Domeykite Cu3As I 43d 4 3m Kutinaite Cu14Ag6As7 P m3m 4/m 3 2/m Dienerite? Ni3As I 43d 4 3m
Help on  Strunz Class: Strunz Class: 02.AA.10b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.A - Simple Sulfides, Selenides, etc
  02.AA -Alloys of metalloids with Cu, Ag, Sn, Au
02.AA.10b Domeykite Cu3As I 43d 4 3m

Other Domeykite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Domeykite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 02.AA.10b





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