Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)
{???} Distinct, {???} Indistinct
Perfect on {010}, distinct on {100}
3CaAl 2Si 2O 8 · CaCO 3Anthony et al , Handbook of mineralogy (2001)
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)