Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.79-2.873.355-3.433
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
{???} Good, {???} Good
Mohs Hardness
5.5-6-9999
2
10
👆🏻
Chemical Composition
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)