ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Mg 3(Al,Cr) 2(SiO 4) 3Gemdat.org , Management Team (2012)
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references