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Corundum - Al₂O₃

Classification: Oxide
Atomic numbers: 13 & 8
Atomic weight: 101.94
Melting point (C): 2050
Boiling point (C): 2250
Density (g/cm3): 3.95-4.10
Refractive index (n=): 1.75-1.76
Hardness (Mosh-scratch): 9
Crystal structure: Hexagonal-rhombohedral: (10T1) rhomb
Color (solid): Grey/black
Cleavage: Basal: (0001)