Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.842.79-2.87
1
7.18
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Fracture
Subconchoidal, Conchoidal
Conchoidal
Cleavage
{0001} good, {10 1 0} parting
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
Mohs Hardness
7.5-85.5-6
2
10
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Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references