Irregular/uneven, UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Uneven
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.
SrCO 3Walter Schumann , Gemstones of the world (2001) More from other references