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gerard15 | 17:58 Tue 01st Jan 2019 | Quizzes & Puzzles
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What's the hardest rock. No letters given

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..Letter count?
Sorry, do you mean no letter count?
granite?
Osmium is the hardest and densest mineral in the Earth's crust - depends how they are classing 'Rock'.
could also be diamond, commonly referred to as rocks.

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