Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.79-2.875.85-6.15
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
Fair in four directions forming octahedrons
Mohs Hardness
5.5-63.5-4
2
10
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Chemical Composition
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references