Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Ca 2 MgAl 2 BSi 4 O 15 OH Gemdat.org, Management Team (2012)
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.