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