Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.643.26-3.41
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Fibrous, ConchoidalWalter Schumann
Cleavage
Absent
Distinct on {100}, poor on {110}; parting on {001}
Mohs Hardness
6.5-77-8.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
AlAl6O3BSi3O18