Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.212.65
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Splintery
ConchoidalWalter Schumann
Cleavage
Good on {110}, poor on {100}
None
Mohs Hardness
7.5-9999
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
SiO 2Ulrich Henn and Claudio C.