Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.63-3.92.97-3.03
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Indistinct
{001} Poor
Mohs Hardness
7.5-87
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
CaB 2(SiO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references