Colorless, Greenish, Colorless, Green, gray, Yellow
Greenish, White, White, gray, Greenish, Reddish, White, gray, Greenish, Green, gray, White, gray, Greenish, Green, gray
Irregular/uneven, Uneven
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)