Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.375.9-6.3
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal, Uneven
Cleavage
Perfect on {010}, good on {100}
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
7.54.5-5
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references