ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Mg 3(Al,Cr) 2(SiO 4) 3Gemdat.org , Management Team (2012)
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.