Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.63-3.92.72-2.75
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven
Cleavage
Indistinct
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
7.5-86-6.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)