Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.63-3.92.90-2.98
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
Indistinct
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
7.5-87.5-8
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references