Meaning of corundum in English:


Pronunciation /kəˈrʌndəm/

See synonyms for corundum on

Translate corundum into Spanish


mass noun
  • Extremely hard crystallized alumina, 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.’
    • ‘One of these occurs at Baggot's Rock, where specks of corundum are found.’
    • ‘Reports of gem-quality corundum are rare in Wyoming, although both ruby and sapphire have been noted.’
    • ‘In 1995 field reconnaissance in the central Laramie Range of southeastern Wyoming led to the discovery of a new source of gem- and near-gem-quality cordierite and corundum.’
    • ‘Chapters 2-19 describe eighteen specific traditional gemstones or families, beginning with corundum and ending with rhodonite.’
    • ‘He also found particles of gemstones such as corundum, garnet, rutile, and argentite.’
    • ‘In summary, the presence of additional occurrences of gem-quality corundum and cordierite in Wyoming needs to be seriously considered’
    • ‘This is, of course, ludicrous because corundum and quartz are mutually exclusive.’
    • ‘Sapphire comes in every color (except red, because red corundum is called ruby) and is one of the hardest/most durable gems next to diamond.’
    • ‘Also on a hillside to the north is a contact metamorphosed bed rich in small, dark blue, platy corundum crystals.’
    • ‘Diamond has been assigned a hardness value of 10, only a single point higher than corundum on Mohs scale, although it is far harder than this would indicate.’
    • ‘In the 1980s, geologists in Moscow found several small diamonds and minerals, such as zircon, garnet, and corundum, in the alluvia of the River Karla.’
    • ‘All granites are peraluminous as implied by the ubiquity of normative corundum.’
    • ‘The grayish-blue, partly gemmy cordierite, when first discovered in the early twentieth century, was mistakenly reported as corundum.’
    • ‘First, to prove beryllium could diffuse into corundum and create a color change, he heated pink sapphires with beryllium and got yellow rims.’


Early 18th century from Tamil kuruntam and Telugu kuruvindam.