Atom Nb : Niobium(columbium), number : 41
appears in following minerals :
- baotite
- holtite
- labuntsovite
- mossite
- nioboeschynite.Ce
- olmsteadite
- pandaite
- plumbomicrolite
- rankamaite
- rynersonite
- vuonnemite
- westgrenite
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