Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
{???} Imperfect, {???} Imperfect