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Lapis lazuli rough stones

Property Specification
Chemical Composition Sodium aluminum silicate with sulfur (Na8(Al6Si6O24)S2)
Color Deep blue, with golden pyrite inclusions
Hardness 5 to 5.5 on the Mohs scale
Specific Gravity 2.7 to 2.9 g/cm³
Transparency Opaque
Luster Vitreous to sub-metallic
Texture Rough, uneven, often granular
Crystal Structure Massive, granular, occasionally columnar
Cleavage None
Fracture Conchoidal
Density 2.7 – 2.9 g/cm³
Refractive Index 1.5 to 1.7
Streak Pale blue to white
Associated Minerals Pyrite, Calcite, and other minerals
Origin Afghanistan, Chile, Russia, USA, and others
Uses Jewelry, carvings, ornamental stones
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