Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.212.60-3.02
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Splintery
-
Cleavage
Good on {110}, poor on {100}
Perfect
Mohs Hardness
7.5-9999
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)