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