Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.46-3.503.25-3.35
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect
Perfect in three directions
Mohs Hardness
6-75
2
10
👆🏻
Chemical Composition
MgAlBO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references