Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.23-3.262.33-2.37
1
7.18
👆🏻
Fracture
Conchoidal
ConchoidalWalter Schumann
Cleavage
Perfect on {010} imperfect on {100}
Perfect on {010}, good on {100}
Mohs Hardness
6.5-77.5
2
10
👆🏻
Chemical Composition
Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Be 2BO 3(OH)Ulrich Henn and Claudio C.