Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
-99995.00-5.30
1
7.18
👆🏻
Fracture
-
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Indiscernible
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
-99996
2
10
👆🏻
Chemical Composition
(Na,Li)3Al6Si6O18(BO3)3(OH)4
Fe 2O 3Arthur Thomas , Gemstones (2009)