Emeralds
VIBRANIUM LTD
Emeralds
| Property | Specification |
| Chemical Formula | Be?Al?Si?O?? |
| Crystal System | Hexagonal (Trigonal) |
| Color | Green to Bluish-Green |
| Hardness (Mohs) | 7.5 - 8 |
| Specific Gravity | 2.67 - 2.78 |
| Refractive Index | 1.565 - 1.602 |
| Birefringence | 0.005 - 0.009 |
| Luster | Vitreous |
| Transparency | Transparent to Translucent |
| Pleochroism | Moderate to Strong (Yellow-Green, Blue-Green) |
| Optical Character | Uniaxial (-) |