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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Ruby-Ruby
Ruby
Chemical
Formula
 Al2O3:Cr
Species
 Oxides & Hydroxides
Crystal
System
 Trigonal
Mohs
Scale
 9
Specific
Gravity
 4.0
Color
 Red, may be brownish, purplish or pinkish
Streak
 white
Luster
 Vitreous
Refractive
Index
 nω=1.768–1.772nε=1.760–1.763
Diaphaneity
 transparent
Cleavage
 No true cleavage
Fracture
 Uneven or conchoidal
Crystal Habit：Varies with locality. Terminated tabular hexagonal prisms.
Ruby8888
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Ruby8884
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