Mineral | Tourmaline (Dravite) |
---|---|
Chemistry | NaMg3Al6Si6O18(BO3)3(OH)4 |
Color | Pale Yellow - Vivid Yellow |
Refractive Index | 1.624 - 1.644 |
Birefringence | 0.018 - 0.040 |
Specific Gravity | 3.06 |
Mohs Hardness | 7.0 - 7.5 |
3.92ct - 10x8mm (YT0167)
3.41ct - 9mm (YT0166)
4.28ct (YT0165)
4.25ct - 10mm (TG1736)
4.76ct - 11x9mm (TG1735)
1.61ct - 8mm (YT0162)
5.82ct - 11mm (BT0164)
1.76ct - 7mm (YT0130)
6.41ct - 12x10mm (YT0115)
5.98ct (YT0106)
6.64ct - 14x12mm (YT0062)
6.68ct - 14x12mm (PT0609)
5.16ct (YT0015)