ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)
CaBe 2(PO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
(Fe,Mg) 3Al 2(SiO 4) 3gemdat.org , Management Team (2012)