Jadeite
NaAlSi2O6IMA symbol: Jdapproved
Jadeite is a silicate mineral with the formula NaAlSi2O6, crystallizing in the monoclinic system. It has a Mohs hardness of 6.5-7, typically white or green in color, with a pearly or vitreous luster, a specific gravity of 3.33-3.35. Its streak is red.
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/c 1 |
| Cell (Å, °) | a = 9.4278, b = 8.5651, c = 5.2262; α = 90, β = 107.624, γ = 90 |
| Cell volume | 402.208 ų, Z = 4 |
| Axial ratios | 1.1007:1:0.6102calculated from COD 9010470 |
| Source structure | COD 9010470 (American Mineralogist, 2008) — 1 of 66 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.92 | 2.827 | 2.49 | 2.415 | 2.83 | 1.967 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 41.1 | 40 | 33.8 | 27.9 | 20.4 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010470; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.338 g/cm³calculated from COD 9010470 |
|---|---|
| Hardness (Mohs) | 6.5-7single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.33-3.35 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | green, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 202.14 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 11.37%, Al 13.35%, Si 27.79%, O 47.49% |
Classification
| Nickel-Strunz (10th) | 9.DA.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DA.25Wikidata (CC0) |
| Dana (8th) | 65.1.3c.1Wikidata (CC0) |