Tenacity
Brittle
-
Solubility
-
Insoluble in acids
Durability
-
-
Specific Gravity
2.33-2.374.20-4.30
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
Perfect on {010}, good on {100}
{110} good, 100 moderate, parting on {092} and {011}
Mohs Hardness
7.56-6.5
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)