| Mineral | Tourmaline (Elbaite) |
|---|---|
| Chemistry | Na(Li1.5,Al1.5)Al6Si6O18(BO3)3(OH)4 |
| Color | Green - Blue |
| Refractive Index | 1.624 - 1.644 |
| Birefringence | 0.018 - 0.040 |
| Specific Gravity | 3.06 |
| Mohs Hardness | 7.0 - 7.5 |
8.01ct - 11mm (PA2128)
5.96ct (PA2126)
1.89ct (PA1929)
3.81ct (PA1614)
11.09ct (PA1604)
9.24ct - 13x11mm (PA1596)
3.26ct (PA1495)
4.86ct (PA2122)
3.63ct (PA2117)
2.19ct (PA2103)
2.73ct (PA2111)
2.32ct - 9x7mm (PA2108)
1.93ct (PA2105)
2.18ct (PA2104)
2.77ct - 10x8mm (PA2102)
2.44ct - 10x8mm (PA2101)
2.92ct (PA2100)
2.64ct (PA2099)
4.06ct (PA2098)
3.98ct (PA2096)
12.59ct - 15x13mm (PA1989)
5.69ct - 12x10mm (PA1934)
10.46ct (PA0122)
1.10ct - 7x5mm (PA0959)