Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Sub-Conchoidal, Irregular/uneven, Sub-Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Good to perfect_usually N/A
[100] Perfect, [110] Good, [011] Distinct
CuAl6(PO4)4(OH)8 • 4H2O
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references