Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.642.77
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
Uneven
Cleavage
Absent
Perfect [001] good [010] poor [110]
Mohs Hardness
6.5-76-6.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)