Rough Blue Sapphire and Facts

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Rough Blue Sapphire and Facts

Facts about Blue Sapphire gemstone as follows:

Hardness: 9
Transparency: transparent to translucent
Lustre: Adamantine to vitreous
Specific Gravity: 4-4.1
Cleavage: None
Streak: Colorless
Fracture: Conchoidal to uneven
Chemical name: Aluminium oxide
Formula: Al2 O3
Structure: Hexagonal, trigonal
Refractive index: 1.76–1.77

In this video, you see a gemstone, rough blue sapphire which found in Sri Lanka

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