Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
[001] good, [210] distinct
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references