INSPIRE
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niobium

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niobium
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Niobium, formerly columbium, is a chemical element with the symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite. - http://en.wikipedia.org/wiki/Niobium
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