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Hauyn rough stones

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
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