Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.63-3.93.13-3.75
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Subconchoidal, Uneven, Conchoidal
Cleavage
Indistinct
Poor on {100}
Mohs Hardness
7.5-86
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references