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