noun
or poly·mig·nite ˌpälēˈmigˌnīt, -lə̇m-
( -s )
Etymology: Swedish polymignit, from poly- + mign- (from Greek mignynai to mix) + -it -ite — more at mix
: a mineral (Ca,Fe,Y,etc.,Zr,Th) (Cb,Ti,Ta)O 4 consisting of a niobate and titanate of the metals of the cerium group with iron and calcium