Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Distinct on {100}, poor on {110}; parting on {001}
Perfect on [10 1 1] three directions with angle of 74° 55