The answer is DIAMOND. Since it is a natural mineral, diamond would be considered a 'rock.'
Diamond is the hardest naturally occurring mineral, topping Mohs' Scale of Hardness with a relative hardness value of 10.
Discover amazing facts about diamonds on BrilliantEarth.com and GIA.edu.
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During the course of the contest, you can obtain the Daily Scrambled Word for any Sweepstakes Day without purchase of a Chicago Sun-Times newspaper by sending an email to win@suntimes.com to get free one-day access to the Chicago Sun-Times e-paper.
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TIP! Word-Buff.com shares techniques to improve your ability to unscramble anagrams quickly.