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Sapphire is a variety of the mineral corundum, which is composed almost entirely of aluminum oxide.—David Bressan, Forbes.com, 26 June 2025 Scientists are particularly concerned about the effects of aluminum incineration as aluminum oxides produced during the high-altitude burn-up are known to cause ozone depletion.—Tereza Pultarova, Space.com, 27 May 2025 Some of these droplets vaporize into aluminum oxide aerosol, while others scatter and cool down, eventually drifting to the ground in the form of nano- and micrometer-sized bits of aluminum.—Tereza Pultarova, Space.com, 5 May 2025 Brent Lewin/Redux That turned out to be sapphire, a crystal of aluminum oxide that can be synthesized in the laboratory.—IEEE Spectrum, 24 June 2021 See All Example Sentences for aluminum oxide
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