ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Mg 3(Al,Cr) 2(SiO 4) 3Gemdat.org , Management Team (2012)
Fe 2O 3Arthur Thomas , Gemstones (2009)