Answer:
NIOBIUM
| Answer | Crossword Clue |
|---|---|
| NIOBIUM | Element in stainless steel |
| NIOBIUM | Element used in alloy steels |
| NIOBIUM | Its principal ore is columbite |
| NIOBIUM | Element named for a mythical queen |
| Answer | Crossword Clue |
|---|---|
| NIOBIUM | Element in stainless steel |
| NIOBIUM | Element used in alloy steels |
| NIOBIUM | Its principal ore is columbite |
| NIOBIUM | Element named for a mythical queen |