Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.79-2.875.00-5.30
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
5.5-66
2
10
👆🏻
Chemical Composition
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe 2O 3Arthur Thomas , Gemstones (2009)