niobium
Instance URI: http://resource.geosciml.org/classifier/cgi/commodity-code/niobium
Within scheme: South Australian Commodity Codes
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.