Answer: ALUMINA
ALUMINA is a crossword puzzle answer that we have spotted 4 times.
Referring Clues:
- Oxide found in rubies and sapphires
- Bauxite component
- Processed bauxite
- Oxide in rubies and sapphires
Last Seen In:
- New York Times - June 07, 2016
- New York Times - May 06, 2015
- Universal - August 17, 2014
- Washington Post - November 07, 2004
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