ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
(Fe,Mg) 3Al 2(SiO 4) 3gemdat.org , Management Team (2012)
Pb 5(AsO 4) 3ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references