| General Information | ||||||
|---|---|---|---|---|---|---|
| Chemical Formula |
| |||||
| Physical Properties of Beryllonite | ||||||
| Mohs Hardness | 5.5 to 6, Blue Chart Gem Identification (2010) More from other references | |||||
| Specific Gravity | 2.79 to 2.87, Blue Chart Gem Identification (2010) More from other references | |||||
| Tenacity | Brittle, Blue Chart Gem Identification (2010) | |||||
| Cleavage Quality | Perfect, Blue Chart Gem Identification (2010) More from other references | |||||
| Fracture | Conchoidal, Gemstones (2009) | |||||
| Refractive Index | 1.552 to 1.562, Blue Chart Gem Identification (2010) More from other references | |||||
| Optical Character | Biaxial/-, Blue Chart Gem Identification (2010) More from other references | |||||
| Birefringence | 0.009 to 0.010, Blue Chart Gem Identification (2010) More from other references | |||||
| Pleochroism | None, Gemstones (2009) | |||||
| Dispersion | ||||||