: a dark gray to black dense to fine-grained igneous rock that consists of basic plagioclase, augite, and usually magnetite
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Some metals like chromium and nickel can derive from weathering of basalt, a type of volcanic rock quite common worldwide, and some metamorphic rocks.
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David Bressan, Forbes.com, 28 May 2025
Flashback: Constructed in 1866, the 32-foot pyramid was built from basalt taken from a ledge on the north side of what is now Oswego Lake and could withstand temperatures of up to 2,800° Fahrenheit.
—Meira Gebel, Axios, 17 Jan. 2025
In the past, rock quarries would didn't have much use for the basalt rock dust that was a waste product of their mining process.
—Julia Jacobo, ABC News, 22 Apr. 2025
Rocks like limestone and basalt naturally absorb carbon dioxide from the air.
—Julia Jacobo, ABC News, 22 Apr. 2025
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David Bressan, Forbes.com, 28 May 2025
Flashback: Constructed in 1866, the 32-foot pyramid was built from basalt taken from a ledge on the north side of what is now Oswego Lake and could withstand temperatures of up to 2,800° Fahrenheit.
—Meira Gebel, Axios, 17 Jan. 2025
In the past, rock quarries would didn't have much use for the basalt rock dust that was a waste product of their mining process.
—Julia Jacobo, ABC News, 22 Apr. 2025
Rocks like limestone and basalt naturally absorb carbon dioxide from the air.
—Julia Jacobo, ABC News, 22 Apr. 2025
See All Example Sentences for basalt
Cite this Entry
“Basalt.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/basalt. Accessed 16 Jun. 2025.
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: a dark gray to black usually fine-grained igneous rock
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