Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.08-3.122.69-2.79
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
{010} Perfect
Poor on {0001}
Mohs Hardness
7.55.5-6.5
2
10
👆🏻
Chemical Composition
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references