Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.352.90-3.40
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven, ConchoidalWalter Schumann
Cleavage
Perfect in three directions
Indiscernible
Mohs Hardness
57-7.5
2
10
👆🏻
Chemical Composition
CuSiO 2(OH) 2Michael 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.