Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
MgCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references