Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Subconchoidal, Gemstones (2009)
Perfect on [10 1 1] three directions with angle of 74° 55
Perfect prismatic, two directions {110} ∧ {1 1 0} at 87°