Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)