Uneven, Uneven, Conchoidal, Uneven, Gems, Sixth Edition (2006)
Sub-Conchoidal, Irregular/uneven, Sub-Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Perfect on {001}, good on {010}
[100] Perfect, [110] Good, [011] Distinct
(Na,Ca)Al1-2Si3-2O8
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references