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The hardness of a mineral is categorized on the Mohs hardness scale with talc as 1 and diamond as 10. A mineral can only be scratched bya mineral that is as hard or harder than the first mineral. So talc can scratch talc but nothing else. A diamond can scratch every other mienral including itself.

Cordundum with a hardness of 9 can't scratch diamonds but can scratch a lot of other minderals.

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14y ago

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