Tenacity
-
Brittle
Solubility
insoluble
-
Durability
-
-
Specific Gravity
3.95-4.035.00-5.30
1
7.18
👆🏻
Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
None, but may exhibit parting
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
96
2
10
👆🏻
Chemical Composition
Al 2 O 3
Fe 2O 3Arthur Thomas , Gemstones (2009)