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Date: 1999-10-05 11:08:45Chemical elements Refractory metals Transition metals Niobium Tantalum Coltan Pyrochlore Ferroniobium Ore Chemistry Matter Oxide minerals | Nb Columbium (Niobium) by Larry D. CunninghamAdd to Reading ListSource URL: minerals.usgs.govDownload Document from Source WebsiteFile Size: 28,27 KBShare Document on Facebook |