Conchoidal, Conchoidal, Gemstones (2009), Uneven
Sub-Conchoidal, Irregular/uneven, Sub-Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Perfect on { 2 01} fair on {010}
[100] Perfect, [110] Good, [011] Distinct
Cu2CO3(OH)2
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references