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 |
3.43ct (CT0319)
1.09ct (CT0317)
0.60ct - 5mm (CT0314)
0.63ct (CT0312)
1.52ct - 9x7mm (CT0311)
1.26ct - 8x6mm (CT0304)
1.66ct (CT0302)
1.63ct (CT0291)
4.60ct (CT0285)
2.91ct (CT0284)
2.98ct (CT0283)
2.04ct (CT0282)
2.20ct (CT0278)
2.06ct (CT0277)
1.51ct - 6mm (CT0274)
1.82ct (CT0271)
6.16ct (CT0269)
4.31ct (CT0257)
3.04ct (CT0245)
2.68ct - 10x8mm (CT0243)
5.28ct (CT0242)
4.01ct (CT0232)
5.82ct (CT0225)
4.27ct (CT0212)