White, Colorless, Blue, Red, Green, Yellow, Violet
White, Colorless, Greenish, White, Colorless, gray, pink, Greenish, White, Greenish, Reddish
Not Available
Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
SiO 2Ulrich Henn and Claudio C.
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references