Ductile white metallic element; symbol Nb (7)

I believe the answer is:

niobium

(Other definitions for niobium that I've seen before include "Silvery-grey metal, Nb" , "Chemical element, Nb" , "Silver-grey metal, Nb" , "Superconductive element" , "Silver-grey metallic element" .)

I've seen this clue in The Mirror.

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