Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.62-3.803.05-3.21
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Subconchoidal, Splintery
Cleavage
None
Good on {110}, poor on {100}
Mohs Hardness
7-7.57.5
2
10
👆🏻
Chemical Composition
Mg 3(Al,Cr) 2(SiO 4) 3Gemdat.org , Management Team (2012)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references