Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Uneven, Gemstones (2009), Splintery
{???} Distinct, {???} Indistinct
Perfect on {100} and {001}
3CaAl 2Si 2O 8 · CaCO 3Anthony et al , Handbook of mineralogy (2001)
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.