Lazurite
Na7Ca(Al6Si6O24)(SO4)(S3)-·H2OIMA symbol: Lzrgrandfathered
Lazurite is a silicate mineral with the formula Na7Ca(Al6Si6O24)(SO4)(S3)-·H2O, crystallizing in the cubic system. It has a Mohs hardness of 5-5.5, typically blue, green or violet in color, with a vitreous luster, a specific gravity of 2.38-2.45. Cleavage is imperfect.
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Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 2 3 |
| Cell (Å, °) | a = 9.077, b = 9.077, c = 9.077; α = 90, β = 90, γ = 90 |
| Cell volume | 747.872 ų, Z = 2 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 9012653 |
| Source structure | COD 9012653 (Crystallography Reports, 2002) — 1 of 5 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.706 | 6.418 | 2.426 | 2.62 | 1.935 | 2.87 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 56.8 | 51.4 | 36.2 | 32 | 31.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012653; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.697 g/cm³calculated from COD 9012653 |
|---|---|
| Hardness (Mohs) | 5.5single sourceWikidata (CC0) 5-5.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.38-2.45 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | blue, green, violetsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | imperfectDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 9.FB.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.FB.10Wikidata (CC0) |
| Dana (8th) | 76.2.3.4Wikidata (CC0) |