niobite

Noun
  1. A black mineral that is an ore of niobium and tantalum (synset 114708020)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym:
    • atomic number 41, nb, niobium - a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
    • atomic number 73, ta, tantalum - a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
    same as: columbite

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