#niobium__Nb__atomic_number_41  a soft gray ductile metallic element used in alloys; occurs in niobite; formerly called columbium
  supertype:  #metallic_element__metal  any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
  substance of:  #niobite
  subtype:  #columbium  a former name for niobium

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