Uneven, Conchoidal, Gems, Sixth Edition (2006)
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
[001] good, [210] distinct