ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
ZrSiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
SiCArthur Thomas , Gemstones (2009)