Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Distinct on {100}, poor on {110}; parting on {001}
None, may show partings on {0001} and {10 1 1}