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 |