Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.402.24-2.29
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Uneven, Subconchoidal, Conchoidal
Cleavage
Indiscernible
Very poor [100]
Mohs Hardness
7-7.55-5.5
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.
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references