Irregular/uneven, UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Uneven
Uneven, Conchoidal, UnevenArthur Thomas, Brittle
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references