Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.16-3.432.79-2.87
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{110} Good, {110} Good
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
Mohs Hardness
5-65.5-6
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references