polymignyte
noun
poly·mig·nyte
variants
or polymignite
ˌpälēˈmigˌnīt,
-lə̇m-
plural -s
: a mineral (Ca,Fe,Y,etc.,Zr,Th) (Cb,Ti,Ta)O4 consisting of a niobate and titanate of the metals of the cerium group with iron and calcium
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Merriam-Webster unabridged
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