Irregular/uneven, UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Uneven
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Perfect on {110} and {1 1 0}
None, may show partings on {0001} and {10 1 1}
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.
Fe 2O 3Arthur Thomas , Gemstones (2009)