Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.652.60-2.65
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven, Conchoidal
Cleavage
None
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
76-6.5
2
10
👆🏻
Chemical Composition
SiO 2Walter Schumann , Gemstones of the world (2001)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)