Dyscrasite
Ag3+xSb1-x (x ≈ 0.2)IMA symbol: Dysgrandfathered
Dyscrasite is a sulfide or sulfosalt mineral with the formula Ag3+xSb1-x (x ≈ 0.2), crystallizing in the orthorhombic system. It has a Mohs hardness of 2-3, typically black, brown, green or yellow in color, with an adamantine or resinous luster, a specific gravity of 8.327.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P m m 2 |
| Cell (Å, °) | a = 3.008, b = 4.828, c = 5.214; α = 90, β = 90, γ = 90 |
| Cell volume | 75.721 ų, Z = 1 |
| Axial ratios | 0.6230:1:1.0800calculated from COD 9004100 |
| Source structure | COD 9004100 (The Canadian Mineralogist, 1976) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.293 | 2.294 | 2.414 | 2.606 | 1.277 | 1.369 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 49.7 | 39 | 24.3 | 18.5 | 18.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004100; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 9.767 g/cm³calculated from COD 9004100 |
|---|---|
| Hardness (Mohs) | 2-3single sourceDana's System, 2nd Appendix (1909) |
| Specific gravity | 8.327 g/cm3single sourceDana's System, 2nd Appendix (1909) |
| Color | black, brown, green, yellowsingle sourceDana's System, 2nd Appendix (1909) |
| Luster | adamantine, resinoussingle sourceDana's System, 2nd Appendix (1909) |
Classification
| Nickel-Strunz (10th) | 2.AA.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.AA.35Wikidata (CC0) |