Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.403.34-3.44
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
Indiscernible
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
7-7.58-8.5
2
10
👆🏻
Chemical Composition
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.
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references