Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.845.00-5.30
1
7.18
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Fracture
Subconchoidal, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{0001} good, {10 1 0} parting
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
7.5-86
2
10
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Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
Fe 2O 3Arthur Thomas , Gemstones (2009)