Wurtzite
ZnSIMA symbol: Wurgrandfathered
Wurtzite is a sulfide or sulfosalt mineral with the formula ZnS, crystallizing in the hexagonal system. It has a Mohs hardness of 3.5-4, typically black or brown in color, with a resinous luster, a specific gravity of 5.3-5.65. Its streak is brown.
Photos
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Crystallography
| Crystal system | hexagonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 63 m c |
| Cell (Å, °) | a = 3.8227, b = 3.8227, c = 6.2607; α = 90, β = 90, γ = 120 |
| Cell volume | 79.2 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.6378calculated from COD 1100044 |
| Source structure | COD 1100044 (Acta Crystallographica Section C, 1989) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.927 | 3.311 | 1.765 | 1.911 | 3.13 | 1.631 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 90.9 | 71 | 70.5 | 58.5 | 47.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1100044; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.086 g/cm³calculated from COD 1100044 |
|---|---|
| Hardness (Mohs) | 3.5-4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 5.3-5.65 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | black, brownsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | brownsingle sourceWikidata (CC0) brownsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 97.47 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Zn 67.1%, S 32.9% |
Classification
| Nickel-Strunz (10th) | 2.CB.45Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.CB.45Wikidata (CC0) |
| Dana (8th) | 2.8.7.1Wikidata (CC0) |