There are 3 solutions. The longest is SAPPHIRE with 8 letters, and the shortest is RUBY with 4 letters.
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No, "ALUMINA" hasn´t seen a spike right now. Solvers are most interested in: Object, Father, Follow, System and Significant.
Solutions are between 4 and 8 letters long.
| Clue | Answer |
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| Oxide in rubies and sapphires (7) | |
| Metal oxide found in many clays (7) | |
| Processed bauxite (7) | |