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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Sapphire-Sapphire
Sapphire
Chemical
Formula
 Al2O3
Species
 Oxides & Hydroxides
Crystal
System
 Trigonal
Mohs
Scale
 9
Specific
Gravity
 3.95-4.03
Color
 Every color except a shade of red – which is called a ruby – or pinkish-orange (the padparadscha)
Streak
 white
Luster
 vitreous
Refractive
Index
 nω=1.768–1.772nε=1.760–1.763,Birefringence 0.008
Cleavage
 none
Fracture
 conchoidal, splintery
Crystal Habit：massive and granular
Sapphire8955
Sapphire8955
Sapphire8954
Sapphire8954
Sapphire8953
Sapphire8953

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