Domeykite Mineral Data

General Domeykite Information

Chemical Formula:

Cu3As

Composition:

Molecular Weight = 265.56 gm

Copper 71.79 % Cu

Arsenic 28.21 % As

______

100.00 %

Empirical Formula:

Cu₃As

Environment:

Of hydrothermal origin.

IMA Status:

Valid Species (Pre-IMA) 1845

Locality:

Algodones mines, Coquimbo, Chile. Link to MinDat.org Location Data.

Name Origin:

Named after the Chilean mineralogist, I. Domeyk (1802-1889).

Name Pronunciation:

Domeykite + Pronunciation

Synonym:

ICSD 100149

PDF 44-1475

Domeykite Image

Images:

Domeykite

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

Domeykite Crystallography

Cell Dimensions:

a = 9.611, Z = 16; V = 887.78 Den(Calc)= 7.95

Crystal System:

Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: I 43d

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.05(1), 1.888(0.7), 1.965(0.5),

Crystal Structure:

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Help on Above

Iglesias J E , Nowacki W , Zeitschrift fur Kristallographie , 145 (1977) p.334-345, Refinement of the crystal structure of alpha domeykite,, a structure related to the A15 type, Locality: Mohawk No. 2 mine, Keweenaw County, Michigan, USA

Physical Properties of Domeykite

Cleavage:

None

Color:

Gray, Yellow brown, Silver white, Tin white.

Density:

7.2 - 8.1, Average = 7.65

Diaphaneity:

Opaque

Fracture:

Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

3-3.5 - Calcite-Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

black gray

Optical Properties of Domeykite

RL Color:

Tin white to steel gray, tarnishes yellowish, then to brownish, and finally to iridescence.

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**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Domeykite

Electron Density:

Bulk Density (Electron Density)=7.18 gm/cc
note: Specific Gravity of Domeykite =7.95 gm/cc.

Fermion Index:

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Domeykite= 53.47 barns/electron
U=PE_Domeykite x rElectron Density= 384.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Domeykite is Not Radioactive

Domeykite Classification

Dana Class:

02.02.02.01 (02)Sulfides - Including Selenides and Tellurides

(02.02)where Am Bn Xp, with (m+n):p=3:1

(02.02.02)Domeykite Group

02.02.02.01 Domeykite Cu3As I 43d 4 3m

02.02.02.02 Kutinaite Cu14Ag6As7 P m3m 4/m 3 2/m

02.02.02.03 Dienerite? Ni3As I 43d 4 3m

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

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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
17 - WWW-MINCRYST

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Ask about Domeykite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Domeykite Specimen Label here :

Domeykite

Cu3As
Dana No: 02.02.02.01 Strunz No: 02.AA.10b
Locality:

Notes: