Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.63-3.93.19-3.56
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, Conchoidal
Cleavage
Indistinct
{110} Perfect, {010} Indistinct
Mohs Hardness
7.5-85.5-6
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)