Colorless, White, gray, Brownish, Greenish
White, Blue, Yellow, Brown, Green, Brownish, Greenish, gray
KAl 2AlSi 3O 10(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references