Uneven, Conchoidal, Gems, Sixth Edition (2006)
Uneven, Conchoidal, Brittle, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
Poor/indistinct on {1120} and {1011}