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Why does corundum make a good abrasive in terms of the Mohs hardness scale?

abrasive corundum good Mohs scale terms
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Why does corundum make a good abrasive in terms of the Mohs hardness scale?

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Corundum, at 9 on the Mohs scale, is second only to diamond in hardness, and is able to scratch all minerals below it on the scale, thus making it a dang good abrasive.

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