Galena
PbSIMA symbol: Gngrandfathered
Galena is a sulfide or sulfosalt mineral with the formula PbS, crystallizing in the cubic system. It has a Mohs hardness of 2.5-2.75, typically gray in color, with a metallic luster, a specific gravity of 7.4-7.6. Its streak is gray.
Photos
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | F m -3 m |
| Cell (Å, °) | a = 5.9315, b = 5.9315, c = 5.9315; α = 90, β = 90, γ = 90 |
| Cell volume | 208.686 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9013403 |
| Source structure | COD 9013403 (Acta Crystallographica, Section C, 1987) — 1 of 8 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.966 | 3.425 | 2.097 | 1.788 | 1.326 | 1.712 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 96.6 | 75.5 | 50.8 | 35.1 | 26.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013403; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 7.615 g/cm³calculated from COD 9013403 |
|---|---|
| Hardness (Mohs) | 2.75single sourceWikidata (CC0) 2.5-2.75single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 7.4-7.6 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 239.26 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 86.6%, S 13.4% |
Classification
| Nickel-Strunz (10th) | 2.CD.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CD.10Wikidata (CC0) |
| Dana (8th) | 2.8.1.1Wikidata (CC0) |