Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.212.08-2.16
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Splintery
Irregular/uneven
Cleavage
Good on {110}, poor on {100}
distinct/good on {1011}
Mohs Hardness
7.54.5
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)