| Property |
Specification |
| Chemical Formula |
Be3Al2(Si6O18) |
| Color |
Blue to blue-green, often light to medium blue |
| Crystal System |
Hexagonal |
| Hardness |
7.5 to 8 on the Mohs scale |
| Specific Gravity |
2.68 to 2.74 |
| Refractive Index |
1.57 to 1.58 |
| Density |
2.67 to 2.74 g/cm³ |
| Cleavage |
Perfect cleavage along the length of the crystal |
| Transparency |
Transparent to translucent |
| Luster |
Vitreous (glassy) |
| Fracture |
Conchoidal |
| Occurrence |
Found in granites, pegmatites, and metamorphic rocks |
| Inclusions |
Common inclusions include gas bubbles, liquid inclusions, and growth tubes |
| Common Shapes |
Rough crystals, elongated, prismatic, or irregular shapes |
| Size |
Ranges from small rough fragments to large crystals |
