Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.403.26-3.36
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
Indiscernible
Good on {100}
Mohs Hardness
7-7.56.5-7
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.
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references