en2015-08-18 18:11 PM CESThttp://inspire.ec.europa.eu/codelist/CommodityCodeValue/niobium:1http://inspire.ec.europa.eu/codelist/CommodityCodeValue/niobiumNiobium, 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