Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.403.82-3.97
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Subconchoidal, Conchoidal
Cleavage
Indiscernible
Perfect on [001] and [011]
Mohs Hardness
7-7.55.5-6
2
10
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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.
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references