ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
(Ca,Cr)MgSi 2O 6Gemdat.org , Management Team (2012)
CaBePO 4(F,OH)Ulrich Henn and Claudio C.