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 |
1.82ct (CT0271)
6.16ct (CT0269)
2.92ct - 7mm (CT0260)
4.31ct (CT0257)
3.10ct (CT0256)
2.51ct (CT0252)
4.15ct (CT0246)
3.04ct (CT0245)
2.68ct - 10x8mm (CT0243)
5.28ct (CT0242)
3.24ct (CT0239)
4.01ct (CT0232)
5.82ct (CT0225)
4.27ct (CT0212)
4.14ct - 11x9mm (CT0211)
4.44ct (CT0201)
2.36ct (CT0197)
3.18ct (CT0193)
2.80ct (CT0190)
4.35ct (CT0189)
15.14ct - 16x14mm (CT0167)
4.63ct (CT0166)
1.59ct (CT0164)
4.47ct (CT0162)