White, Colorless, Blue, Red, Green, Yellow, Violet
Colorless, Green, Black, Brown, Red, Greenish, Yellow, gray
ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Tourmaline is a series of several different minerals with unique chemical formulas.
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)