Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Splintery, UnevenArthur Thomas, Difficult, Fibrous
Na 8Al 6Si 6O 24(SO 4) · H 2OAnthony et al , Handbook of Mineralogy (2001)
NaAlSi 2O 6Ulrich Henn and Claudio C.