Definitions Found:
A black mineral, typically occurring as dense, tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium
- columbitesA black mineral, typically occurring as dense, tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium
- columbiteA black mineral, typically occurring as dense, tabular crystals, consisting of an oxide of iron, manganese, niobium, and tantalum. It is the chief ore of niobium
- tantalitesA rare, dense, black mineral consisting of a mixed oxide of tantalum, of which it is the principal source, and iron
- tantaliteA rare, dense, black mineral consisting of a mixed oxide of tantalum, of which it is the principal source, and iron