Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.26-3.362.90-3.40
1
7.18
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Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann
Cleavage
Good on {100}
Indiscernible
Mohs Hardness
6.5-77-7.5
2
10
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Chemical Composition
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references
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.