Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
SrCO 3Walter Schumann , Gemstones of the world (2001) More from other references