: a dark gray to black dense to fine-grained igneous rock that consists of basic plagioclase, augite, and usually magnetite
Examples of basalt in a Sentence
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Surprisingly, the results showed that the warming of the MCO began about 200,000 years before the flood basalt eruptions.
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Howard Lee, Ars Technica, 8 Sep. 2024
As the National Academies report explains, carbon-dioxide–rich fluids injected into basalt or peridotite formations (two kinds of igneous rock that make up much of the earth’s mantle) react with the rock, converting the dissolved carbon dioxide into solid carbon-containing minerals.
—Fred Krupp, Foreign Affairs, 12 Feb. 2019
The jetty is a 1,500-foot earthwork coil of basalt rock and mud that sprawls into the mirror-like expanse of the Great Salt Lake.
—Matt Ortile, Condé Nast Traveler, 4 Sep. 2024
The professor glanced at them and informed her that all four were basalt, one of the most common rocks on the planet.
—Kathryn Schulz, The New Yorker, 26 Aug. 2024
See all Example Sentences for basalt 
Howard Lee, Ars Technica, 8 Sep. 2024
As the National Academies report explains, carbon-dioxide–rich fluids injected into basalt or peridotite formations (two kinds of igneous rock that make up much of the earth’s mantle) react with the rock, converting the dissolved carbon dioxide into solid carbon-containing minerals.
—Fred Krupp, Foreign Affairs, 12 Feb. 2019
The jetty is a 1,500-foot earthwork coil of basalt rock and mud that sprawls into the mirror-like expanse of the Great Salt Lake.
—Matt Ortile, Condé Nast Traveler, 4 Sep. 2024
The professor glanced at them and informed her that all four were basalt, one of the most common rocks on the planet.
—Kathryn Schulz, The New Yorker, 26 Aug. 2024
See all Example Sentences for basalt
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“Basalt.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/basalt. Accessed 11 Oct. 2024.
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: a dark gray to black usually fine-grained igneous rock
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