Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.402.33-2.37
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann
Uneven
Cleavage
Indiscernible
Perfect on {001}, imperfect on {110}
Mohs Hardness
7-7.54.5-5
2
10
👆🏻
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.
(K,Na)Ca4Si8O20(F,OH)•8(H2O)