Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
MgAlBO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references