corundum definition

  • noun:
    • a very difficult mineral, aluminum oxide, Al2O3, occasionally containing iron, magnesia, or silica, occurring in gem varieties such as for example ruby and sapphire as well as in a common black colored, brown, or blue form made use of mainly in abrasives.
    • an incredibly hard mineral, a type of aluminum oxide with the chemical formula Al2O3, that develops in the shape of the gemstones sapphire and ruby; it's utilized as an abrasive.
    • The mineral alumina (Al2O3), as discovered native in a crystalline condition. Clear types are utilized as gemstones, including sapphire, which is the fine blue variety; the oriental ruby, or purple sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It will be the hardest substance discovered native, next to the diamond.
    • Alumina, or even the oxid of the steel aluminum, as found native in a crystalline state.
    • very difficult mineral used as an abrasive
    • a very difficult mineral, aluminum oxide, Al2O3, sometimes containing metal, magnesia, or silica, that occurs in treasure types such as for instance ruby and sapphire and in a standard black colored, brown, or blue kind made use of mainly in abrasives.
    • an incredibly tough mineral, a kind of aluminum oxide using chemical formula Al2O3, that occurs by means of the gemstones sapphire and ruby; its made use of as an abrasive.
    • The mineral alumina (Al2O3), as discovered native in a crystalline state. Transparent types are employed as gemstones, including sapphire, the good blue variety; the oriental ruby, or purple sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It's the most difficult material discovered local, next to the diamond.
    • Alumina, or the oxid regarding the metal aluminium, as found native in a crystalline condition.
    • quite difficult mineral used as an abrasive

Related Sources

  • Definition for "corundum"
    • a very difficult mineral, aluminum oxide, Al2O3, occasionally…
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  • Sentence for "corundum"
    • Aluminum oxide, when it occurs in…
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