ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
(Ca,Cr)MgSi 2O 6Gemdat.org , Management Team (2012)
KAlSi 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references