Niobite (or columbite),a niobite of iron and manganese containing tantalite of iron with chemical formula ((Fe,Mn)(Nb,Ta)2O6). It is orthorhombic and may rarely form well developed black crystals,as seen here. Niobite is an ore for extracting niobium and tantalum. From Kragero in Norway | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Wiersma, Dirk |
Taille de l’image : | 3417 px × 5125 px |
Model Release : | Non requis |
Restrictions : | - |