Domeykite Mineral Data

Domeykite Mineral Data +

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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).

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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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

Diaphaniety:

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:

None.

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:

r_electron=7.18 gm/cc
note: r_Domeykite=7.95 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Domeykite= 53.47 barns/electron
U=PE_Domeykite x r_electron= 384.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Domeykite is Not Radioactive

Domeykite Classification

Dana Class:

2.2.2.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.2.2)Dana Group

2.2.2.1 Domeykite Cu3As I 43d 4 3m

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

2.2.2.3 Dienerite Ni3As I 43d 4 3m

Strunz Class:

II/A.01-20 II - Sulfides and sulphosalts

II/A - Alloys and alloylike compounds, with Copper, Silver, Gold and Nickel

II/A.01 - Algodonite - Cuprostibite series

II/A.01-10 Algodonite Cu6As P 6₃/mmc 6/m 2/m 2/m

II/A.01-20 Domeykite Cu3As I 43d 4 3m

II/A.01-30 Horsfordite Cu5Sb Unk Cubic

II/A.01-40 Kutinaite Cu14Ag6As7 P m3m 4/m 3 2/m

II/A.01-50 Koutekite Cu5As2 P 6₃/mmc 6/m 2/m 2/m

II/A.01-60 Novakite (Cu,Ag)21As10 C 2/m ? 2/m

II/A.01-70 Cuprostibite Cu2(Sb,Tl) P 4/nmm 4/m 2/m 2/m

Other Domeykite Information

References:

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

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

Domeykite

Cu3As
Dana No: 2.2.2.1 Strunz No: II/A.01-20
Locality:

Notes: