ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)
Subconchoidal, Uneven, Conchoidal, Uneven
(Fe,Mg) 3Al 2(SiO 4) 3gemdat.org , Management Team (2012)
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)