Which of the following is the hardest material ?
Correct answer: C. Corundum
- A. Calcite
- B. Quartz
- C. Corundum
- D. Gypsum
Explanation
Corundum has a Mohs hardness of 9, higher than quartz at 7, calcite at 3, and gypsum at 2. It is the second-hardest natural mineral after diamond.
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