| Formula | Be3Al2Si6O18 |
| Molecular mass | 537.50 g/mol |
| admixture | Fe2O3, V2O3, Cr2O3 |
| IMA Status | Valid |
| Systematics according to IMA (Mills et al., 2009) | |
| Class | |
| Group | |
| Physical Properties | |
| Color | Green, yellowish green |
| Dash color | White |
| Shine | Glass |
| Transparency | Transparent, translucent |
| Mohs hardness | 7.5—8.0 |
| fragility | Fragile |
| Cleavage | imperfect |
| kink | Rough, uneven |
| Density | 2.69-2.78 g/cm³ |
| Crystallographic properties | |
| space group | P6/mmc |
| Syngony | Hexagonal |
| Twinning | |
| Optical properties | |
| optical type | Single axle (-) |
| Refractive index | nω = 1.564–1.595, nε = 1.568–1.602 |
| Birefringence | 0.005-0.009 |
| dichroism | |
| optical relief | Moderate |
| Dispersion of optical axes | 0.014 |
| Pleochroism | Yellowish green to bluish |
| Luminescence | Missing |
| Diffusion | Excellent, 0.008 |
Strode Anna
Anna Strod – director of the jewelry online store Myjewels.ru Author and editor of the jewelry blog Myjewels.ru
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