corundum in a sentence

Example sentences for corundum

Rubies, valued as precious gems, are the mineral corundum in its red form.
Rubies are formed of a mineral called corundum, comprised of aluminum oxide.
No doubt large corundum crystals and pieces of corundum are found each year.
The cordierite occurs along with sillimanite, corundum, and kyanite.
Since corundum has not been reported from here, it is not a true emery deposit.
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