Clausthalite
PbSeIMA symbol: Cthgrandfathered
Clausthalite is a sulfide or sulfosalt mineral with the formula PbSe. It has a Mohs hardness of 2.5-3, typically gray in color, with a metallic luster, a specific gravity of 7.6-8.8. Its streak is black or gray.
Photos
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Crystallography
| Space group | F m -3 m |
|---|---|
| Cell (Å, °) | a = 6.1213, b = 6.1213, c = 6.1213; α = 90, β = 90, γ = 90 |
| Cell volume | 229.367 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9011360 |
| Source structure | COD 9011360 (Acta Crystallographica, Section C, 1987) — 1 of 4 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.061 | 2.164 | 1.369 | 3.534 | 1.767 | 1.25 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 77 | 36.1 | 35.7 | 27.6 | 27.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011360; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 8.287 g/cm³calculated from COD 9011360 |
|---|---|
| Hardness (Mohs) | 2.5-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 7.6-8.8 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | black, graysingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | metallicsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 286.16 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Pb 72.41%, Se 27.59% |
Classification
| Nickel-Strunz (10th) | 2.CD.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CD.10Wikidata (CC0) |