Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
Gems, Conchoidal, Brittle
Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
Ca 3Ti4+2(Fe3+2Si)O 12Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references