Mineral | Tourmaline (Dravite) |
---|---|
Chemistry | NaMg3Cr6Si6O18(BO3)3(OH)3OH |
Color | Green - Vivid Green |
Refractive Index | 1.624 - 1.644 |
Birefringence | 0.018 - 0.040 |
Specific Gravity | 3.06 |
Mohs Hardness | 7.0 - 7.5 |
15.14ct - 16x14mm (CT0167)
2.00ct (CT0160)
12.15ct (CT0144)
1.77ct (CT0137)
3.89ct (CT0115)
1.60ct - 8x6mm (CT0109)
0.78ct - 7x5mm (CT0106)
0.90ct - 8x6mm (CT0103)
3.94ct - 11x9mm (CT0101)
3.33ct (CT0099)
3.81ct - 11x9mm (CT0097)
2.15ct (CT0054)