Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.213.62-3.80
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Splintery
Conchoidal
Cleavage
Good on {110}, poor on {100}
None
Mohs Hardness
7.57-7.5
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Mg 3(Al,Cr) 2(SiO 4) 3Gemdat.org , Management Team (2012)