| Property |
Specification |
| Chemical Composition |
Sodium calcium aluminosilicate (Na₆Ca₁₀Al₆Si₁₂O₃₆) |
| Color |
Blue, violet-blue, greenish-blue, or purple |
| Hardness |
5 to 6 on the Mohs scale |
| Specific Gravity |
2.6 to 2.8 g/cm³ |
| Transparency |
Transparent to translucent |
| Luster |
Vitreous to glassy |
| Texture |
Rough, often granular or massive |
| Crystal Structure |
Isometric (cubic) |
| Cleavage |
None |
| Fracture |
Conchoidal |
| Density |
2.6 – 2.8 g/cm³ |
| Refractive Index |
1.50 to 1.52 |
| Streak |
White or colorless |
| Associated Minerals |
Feldspar, Calcite, and other minerals |
| Origin |
Mostly found in Afghanistan, Mexico, and Myanmar |
| Uses |
Gemstones, ornamental stones, carvings |
