Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Perfect on {001}, poor on {201} with 38.5° angle between the two
Distinct on {100}, poor on {110}; parting on {001}