NIOBIUM is a crossword puzzle answer that we have spotted 4 times.
- Its principal ore is columbite
- Element named for a mythical queen
- Element in stainless steel
- Lustrous metallic element
Last Seen In:
- New York Times - June 01, 2006
- King Syndicate - Thomas Joseph - August 03, 2004
- New York Times - October 01, 1999
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