Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.63-3.93.25-3.35
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
Indistinct
Perfect in three directions
Mohs Hardness
7.5-85
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references