Petalite
LiAlSi4O10IMA symbol: Ptlgrandfathered
Petalite is a silicate mineral with the formula LiAlSi4O10, crystallizing in the monoclinic system. It has a Mohs hardness of 2, a specific gravity of 2.16.
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 2/a 1 |
| Cell (Å, °) | a = 11.737, b = 5.171, c = 7.63; α = 90, β = 112.54, γ = 90 |
| Cell volume | 427.706 ų, Z = 2 |
| Axial ratios | 2.2698:1:1.4755calculated from COD 9008304 |
| Source structure | COD 9008304 (Zeitschrift fur Kristallographie, 1982) — 1 of 6 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.741 | 3.74 | 3.665 | 3.67 | 3.524 | 1.94 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 94.9 | 72.9 | 70.7 | 32.4 | 21.4 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9008304; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.378 g/cm³calculated from COD 9008304 |
|---|---|
| Hardness (Mohs) | 2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.16 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 306.26 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Li 2.27%, Al 8.81%, Si 36.68%, O 52.24% |
Classification
| Nickel-Strunz (10th) | 9.EF.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.EF.05Wikidata (CC0) |