Laurite
RuS2IMA symbol: Lrtgrandfathered
Laurite is a sulfide or sulfosalt mineral with the formula RuS2, crystallizing in the cubic system. It has a Mohs hardness of 7.5, typically black or gray in color, with a metallic luster, a specific gravity of 6.99. Its streak is gray; cleavage is distinct.
Photos
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | P a -3 |
| Cell (Å, °) | a = 5.6106, b = 5.6106, c = 5.6106; α = 90, β = 90, γ = 90 |
| Cell volume | 176.615 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9007833 |
| Source structure | COD 9007833 (Acta Crystallographica, Section C, 1990) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 1.692 | 2.805 | 2.509 | 2.291 | 1.984 | 1.499 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 93.4 | 60.2 | 52.2 | 48.7 | 27 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9007833; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 8.625 g/cm³calculated from COD 9007833 |
|---|---|
| Hardness (Mohs) | 7.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.99 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | black, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | grayDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | distinctDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 165.2 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ru 61.18%, S 38.82% |
Classification
| Nickel-Strunz (10th) | 2.EB.05aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.EB.05aWikidata (CC0) |