Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.402.78
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
Indiscernible
{???} Distinct, {???} Indistinct
Mohs Hardness
7-7.55-6
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.
3CaAl 2Si 2O 8 · CaCO 3Anthony et al , Handbook of mineralogy (2001)