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Domeykite Mineral Data
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General Domeykite Information
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 Chemical Formula: |
Cu3As |
| Composition: |
Molecular Weight = 265.56 gm |
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Copper 71.79 % Cu |
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Arsenic 28.21 % As |
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______ |
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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 |
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PDF 44-1475 |
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Domeykite Image |
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Images:
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Domeykite Crystallography
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| Cell Dimensions: |
a = 9.611, Z = 16; V = 887.78 Den(Calc)= 7.95 |
| Crystal System: |
Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43d |
| X Ray Diffraction: |
By Intensity(I/Io): 2.05(1), 1.888(0.7), 1.965(0.5), |
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Physical Properties of Domeykite
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| 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 |
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Optical Properties of Domeykite
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| 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 |
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∑ R(λ) |
| 400 nm |
43.60 |
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| 420 nm |
45.00 |
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| 440 nm |
46.40 |
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| 460 nm |
47.80 |
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| 480 nm |
49.00 |
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| 500 nm |
50.10 |
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| 520 nm |
51.00 |
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| 540 nm |
51.90 |
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| 560 nm |
52.70 |
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| 580 nm |
53.20 |
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| 600 nm |
53.50 |
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| 620 nm |
53.60 |
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| 640 nm |
53.70 |
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| 660 nm |
53.70 |
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| 680 nm |
53.60 |
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| 700 nm |
53.60 |
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Calculated Relative Intensity Colors of Domeykite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R |
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Calculated Properties of Domeykite
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| Electron Density: |
Bulk Density (Electron Density)=7.18 gm/cc
note: Specific Gravity of Domeykite =7.95 gm/cc.
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| Fermion Index: |
Fermion Index = 0
Boson Index = 1 |
| Photoelectric: |
PEDomeykite = 53.47 barns/electron
U=PEDomeykite x rElectron Density= 384.17 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Domeykite is Not Radioactive |
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Domeykite Classification
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| Dana Class: |
02.02.02.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.02)where Am Bn Xp, with (m+n):p=3:1 |
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(02.02.02)Domeykite Group |
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02.02.02.01 Domeykite Cu3As I 43d 4 3m |
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02.02.02.02 Kutinaite Cu14Ag6As7 P m3m 4/m 3 2/m |
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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 |
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02.A - Simple Sulfides, Selenides, etc |
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02.AA -Alloys of metalloids with Cu, Ag, Sn, Au |
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02.AA.10b Domeykite Cu3As I 43d 4 3m |
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Other Domeykite Information
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| 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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Print or Cut-and-Paste your Domeykite Specimen Label here :
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Domeykite
Cu3As
Dana No: 02.02.02.01 Strunz No: 02.AA.10b
Locality:
Notes:
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