Recent Examples of corundum from the Web
With a Mohs hardness score just a point shy of diamond’s, corundum becomes a red ruby through the timely addition of chromium atoms.
After all, sapphires and rubies are built of the same basic mineral, corundum, a crystallized collaboration of aluminum and oxygen that would be transparent and colorless if not for some artful chemical doping.
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medical Definition of corundum
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Britannica.com: Encyclopedia article about corundum
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