Oldhamite
CaSIMA symbol: Oldgrandfathered
Oldhamite is a sulfide or sulfosalt mineral with the formula CaS, crystallizing in the cubic system. It has a Mohs hardness of 4, typically brown in color, with a metallic luster, a specific gravity of 2.58. Its streak is brown.
Photos
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | F m -3 m |
| Cell (Å, °) | a = 5.6903, b = 5.6903, c = 5.6903; α = 90, β = 90, γ = 90 |
| Cell volume | 184.249 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9008606 |
| Source structure | COD 9008606 (Crystal Structures, 1963) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.845 | 2.012 | 1.272 | 1.643 | 1.162 | 1.423 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 66.2 | 26.4 | 21.8 | 19.7 | 9.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9008606; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.601 g/cm³calculated from COD 9008606 |
|---|---|
| Hardness (Mohs) | 4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.58 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brownsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | brownsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | metallicsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 72.14 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 55.55%, S 44.45% |
Classification
| Nickel-Strunz (10th) | 2.CD.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CD.10Wikidata (CC0) |