Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.723.69-3.81
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
{110} Perfect, {010} Perfect
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
5-68.5
2
10
👆🏻
Chemical Composition
Na 2ZrSi 3O 9 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
BeAl 2 O 4