Tên đá quý bắt đầu B
Gemstone | Crystal System | Density | Hardness | Refractive index | Treatments |
|
hexagonal | 4.95-5.0 | 4.0-5.0 | 1.717-1.818 | none |
hexagonal | 3.64 | 6.0-6.5 | 1.757-1.804 | none | |
hexagonal | 2.72 | 7.5-8.9 | 1.577-1.583 | heat, radiation, fracture filling, oiling | |
microcrystalline | 2.60 | 6.5-7.0 | 1.535-1.539 | none | |
hexagonal | 2.66 | 7.5-8.0 | 1.567-1.572 | none | |
|
monoclinic | 2.97 | 5.5 | 1.602-1.621 | none |