Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Perfect on {110}, poor on {101}, {001} rare
Distinct on {100}, poor on {110}; parting on {001}