White, Colorless, Blue, Red, Green, Yellow, Violet
Greenish, White, White, gray, Greenish, Reddish, White, gray, Greenish, Green, gray, White, gray, Greenish, Green, gray
ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Tourmaline is a series of several different minerals with unique chemical formulas.
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)