Chemical Formula
Al2O3
Color
Red
Hardness
9
Crystal System
Hexagonal
Refractive Index
1.76 - 1.77
SG
3.9 - 4.1
Transparency
Transparent to opaque
Double Refraction
.0008
Luster
Vitreous to adamantine
Cleavage
None, but may exhibit parting
Mineral Class
Corundum
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