Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.842.60-2.65
1
7.18
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Fracture
Subconchoidal, Conchoidal
Uneven, Conchoidal
Cleavage
{0001} good, {10 1 0} parting
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
7.5-86-6.5
2
10
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Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)