Physical Properties
Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.115.35
1
7.18
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Fracture
-
Conchoidal
Cleavage
Indiscernible
Perfect on {100}, imperfect on {001}
Mohs Hardness
7-7.52.5
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.
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)