It's 6.5 on the Mohs scale Crossword Clue
4 letters · New York Times · Friday, July 28, 2000 · 51-Down
Appeared in 1 New York Times Crossword: Friday, July 28, 2000.
Exact puzzle match · New York Times · July 28, 2000 · 51-Down · 4 letters
OPAL0 of 4 letters revealed
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