Tiemannite
HgSeIMA symbol: Tmngrandfathered
Tiemannite is a sulfide or sulfosalt mineral with the formula HgSe, crystallizing in the cubic system. It has a Mohs hardness of 2, typically black or gray in color, with a metallic luster, a specific gravity of 7.15. Its streak is black.
Photos
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Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | F -4 3 m |
| Cell (Å, °) | a = 6.084, b = 6.084, c = 6.084; α = 90, β = 90, γ = 90 |
| Cell volume | 225.2 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9008849 |
| Source structure | COD 9008849 (Crystal Structures, 1963) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.513 | 2.151 | 1.834 | 1.242 | 1.396 | 3.042 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 67.6 | 49.7 | 23.6 | 20.5 | 16.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9008849; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 8.245 g/cm³calculated from COD 9008849 |
|---|---|
| Hardness (Mohs) | 2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 7.15 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 279.55 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Hg 71.75%, Se 28.25% |
Classification
| Nickel-Strunz (10th) | 2.CB.05aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CB.05aWikidata (CC0) |