Color
White, Blue, Yellow, Brown, Green, Brownish, Greenish, gray
Yellow, Brown, Red, White, Green, Reddish, Black
Chemical Composition
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references