Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.08-3.122.90-3.40
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven, ConchoidalWalter Schumann
Cleavage
{010} Perfect
Indiscernible
Mohs Hardness
7.57-7.5
2
10
👆🏻
Chemical Composition
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.