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
SiO 2Ulrich Henn and Claudio C.
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)