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 |
21.82ct (CT0327)
6.48ct (CT0326)
1.83ct (CT0323)
2.13ct - 9x7mm (CT0322)
2.46ct - 8mm (CT0321)
1.35ct (CT0290)
1.86ct (CT0288)
1.82ct (CT0281)
1.67ct (CT0279)
2.16ct (CT0272)
2.92ct - 7mm (CT0260)
3.10ct (CT0256)
3.24ct (CT0239)
4.14ct - 11x9mm (CT0211)
3.18ct (CT0193)
2.80ct (CT0190)
4.63ct (CT0166)
1.59ct (CT0164)
4.47ct (CT0162)
2.46ct - 9x7mm (CT0158)
18.37ct (CT0019)
2.08ct (CT0013)
4.20ct (CT0011)
3.43ct (CT0319)