Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.19-3.232.33-2.37
1
7.18
👆🏻
Fracture
Conchoidal
ConchoidalWalter Schumann
Cleavage
{110} good
Perfect on {010}, good on {100}
Mohs Hardness
5-67.5
2
10
👆🏻
Chemical Composition
KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)
Be 2BO 3(OH)Ulrich Henn and Claudio C.