Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Perfect on [001] and [011]
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.