Minerals are graded according to their hardness, on a scale from 1 to 10. Talc, used as talcum powder, is the softest mineral, rated 1; quartz rates 7. Diamond is rated 10 - the hardest mineral on Earth. Only a diamond can be used to cut and polish another diamond.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/minerals-are-graded-according-to-their-hardness/

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