Uneven, Uneven, Gems, Sixth Edition (2006)
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Al 2O 3Michael OâDonoghue , Gems, Sixth Edition (2006)
CaTiSiO 5Ulrich Henn and Claudio C.