White, Colorless, Blue, Red, Green, Yellow, Violet
Greenish, White, White, gray, Greenish, Reddish, White, gray, Greenish, Green, gray, White, gray, Greenish, Green, gray
Not Available
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
(Mg,Fe)Al 2O 4Gemdat.org , Management Team (2012)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)