Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.375.35
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
Perfect on {010}, good on {100}
Perfect on {100}, imperfect on {001}
Mohs Hardness
7.52.5
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)