Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references