White, Colorless, Blue, Red, Green, Yellow, Violet
Green, Yellow, Colorless, Grey, Brown, White, Red
ConchoidalArthur Thomas, Gemstones (2009)
Uneven, ConchoidalArthur Thomas, Brittle, Metallic
Tourmaline is a series of several different minerals with unique chemical formulas.
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)