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