Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.79-2.872.77
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
Perfect [001] good [010] poor [110]
Mohs Hardness
5.5-66-6.5
2
10
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Chemical Composition
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)