Sapphire

Property	Specification
Chemical Formula	Al₂O₃ (Aluminum Oxide)
Crystal System	Trigonal (hexagonal scalenohedral)
Color	Typically blue; also pink, yellow, green, purple, colorless
Hardness (Mohs)	9
Specific Gravity	3.95 – 4.03
Refractive Index	1.762 – 1.770
Luster	Vitreous
Transparency	Transparent to translucent
Cleavage	None
Fracture	Conchoidal to uneven
Streak	White
Pleochroism	Strong (blue sapphires show greenish-blue to violet-blue)
Fluorescence	Varies depending on trace elements
Crystal Habit	Tabular, bipyramidal, or prismatic crystals

Enquiry Form