Domeykite
Cu3AsIMA symbol: Dograndfathered
Domeykite is a sulfide or sulfosalt mineral with the formula Cu3As, crystallizing in the cubic system. It has a Mohs hardness of 3-3.5, typically white, brown, gray or yellow in color, with a dull or metallic luster, a specific gravity of 7.2-7.75.
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Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | I -4 3 d |
| Cell (Å, °) | a = 9.619, b = 9.619, c = 9.619; α = 90, β = 90, γ = 90 |
| Cell volume | 890 ų, Z = 16 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9008266 |
| Source structure | COD 9008266 (Zeitschrift fur Kristallographie, 1977) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.051 | 1.886 | 1.963 | 2.151 | 1.309 | 3.042 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 87.6 | 53.3 | 46.6 | 25.1 | 23.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9008266; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 7.928 g/cm³calculated from COD 9008266 |
|---|---|
| Hardness (Mohs) | 3-3.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 7.2-7.75 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, gray, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | dull, metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 265.56 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 71.79%, As 28.21% |
Classification
| Nickel-Strunz (10th) | 2.AA.10bWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.AA.10bWikidata (CC0) |