Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)
Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
Al 2Be 3Si 6O 18Martin H.