Aeschynite

aeschynite

allanite

monazite-(Ce)

fersmite

Images

Formulae:
aeschynite-(Ce): (Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
aeschynite-(Nd): (Nd,Ln,Ca)(Ti,Nb)2(O,OH)6
aeschynite-(Y): (Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6 most common

These are multiple oxides containing niobium or tantalum

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