Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Irregular/uneven, UnevenArthur Thomas, Gemstones (2009)
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)