Uneven, Uneven, Gems, Sixth Edition (2006)
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal
None, may show partings on {0001} and {10 1 1}