Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Sub-Conchoidal, Irregular/uneven, Sub-Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Perfect on {010}, indistinct on {100} and {102}
[100] Perfect, [110] Good, [011] Distinct
Ni3(AsO4)2•8(H2O)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references