Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.79-2.873.65-4.55
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
None, but may exhibit slight parting
Mohs Hardness
5.5-67.5-8
2
10
👆🏻
Chemical Composition
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)