| Property | Specification |
| Chemical Formula | Be?SiO? |
| Crystal System | Orthorhombic |
| Color | Colorless, Yellow, Pink, Brown |
| Hardness (Mohs) | 7.5 - 8 |
| Specific Gravity | 2.96 - 3.02 |
| Refractive Index | 1.650 - 1.700 |
| Birefringence | 0.009 - 0.012 |
| Luster | Vitreous |
| Transparency | Transparent to Translucent |
| Pleochroism | None |
| Optical Character | Uniaxial (+) |
| Dispersion | 0.016 |