Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.792.90-2.98
1
7.18
👆🏻
Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
{100} and {010} perfect
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
67.5-8
2
10
👆🏻
Chemical Composition
LiNa(Zr,Ti,Hf)Si 6O 15Ulrich Henn and Claudio C.
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references