ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Irregular/uneven, UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Uneven
(Ca,Cr)MgSi 2O 6Gemdat.org , Management Team (2012)
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.