Enter a clue or pattern or both:
The Clue
Terbium or thulium (9 letter answer)
The Answer
RAREEARTH
Tags
Notes
The answer RAREEARTH is so rare that it appears less than once every 2900 puzzles.
Related Clues
Kind of element
Monazite, e.g.
Oxide of cerium, yttrium, etc.
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