Assertion: ductile grey metallic element | /r/ObjectUse | used in alloy
Facets:
Source sentences:
text: atomic number 41; Nb; niobium (a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium)
text: Nb, atomic number 41, niobium a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
text: Nb, atomic number 41, niobium a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
text: niobium a soft grey ductile metallic element used in alloys