Extremely hard aluminum oxide, used as an abrasive. Ruby and sapphire are varieties of corundum.
- Although blue corundum, zircon, and tourmaline occur in Colorado, they are not known to produce gems.
- Red gem-quality corundum is known as ruby; all other colors of gem corundum are referred to as sapphire, with a prefix denoting the color of the stone.
- Several Colorado gem minerals (lazurite and the state's minor occurrences of corundum and cordierite) form in metamorphic rocks.
Early 18th century: from Tamil kuruntam and Telugu kuruvindam.
Words that rhyme with corundumCarborundum
For editors and proofreaders
Definition of corundum in:
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.