basalt

noun
ba·​salt | \ bə-ˈsȯlt How to pronounce basalt (audio) , ˈbā-ˌsȯlt How to pronounce basalt (audio) \

Definition of basalt

: a dark gray to black dense to fine-grained igneous rock that consists of basic plagioclase, augite, and usually magnetite

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Other Words from basalt

basaltic \ bə-​ˈsȯl-​tik How to pronounce basaltic (audio) \ adjective

Examples of basalt in a Sentence

Recent Examples on the Web

The astronauts found two main types of rocks at their landing: basalts and breccias, according to the Universities Space Research Association. Ryan W. Miller, USA TODAY, "Buzz Aldrin and Neil Armstrong put a flag on the moon. Here's what you can and can't see in the iconic photo," 19 July 2019 The lava formed columns of black basalt at Devils Postpile National Monument, creating surprisingly uniform hexagonal 60-foot columns. Katherine Rodeghier, Dallas News, "Discover Mammoth Lakes, Yosemite’s lesser-known neighbor," 16 July 2019 One theory states that these elevated, thick volcanic floors are the ocean equivalent of continental flood basalts—the product of giant and prolonged outpourings of lava. Robin George Andrews, National Geographic, "This is now the world's largest volcano, geologists say," 15 July 2019 Although views are sparse on the summit, huge basalt shelves and jumbled boulders provide ample seating for a snack break or breather before taking on the final easy mile back to the trailhead. Mare Czinar, azcentral, "Arizona hike: Shady, easy-to-navigate forest trail leads to big mountain views," 21 June 2019 More than twenty years ago, sea lions discovered Willamette Falls, an enormous basalt cascade in the shape of a horseshoe on the Willamette River. Sallie Tisdale, Harper's magazine, "Catechism of the Waters," 10 June 2019 The water is then piped to nearby wells, where the scientists inject it into the basalt rock 3,300 feet under the ground. Andrew Daniels, Popular Mechanics, "Iceland’s Radical Plan to Slow Climate Change," 9 May 2019 Like many Hawaiian volcanoes, Kilauea is made of basalt, a type of lava that flows very easily. Author: Sarah Kaplan, Anchorage Daily News, "What’s happening inside Hawaii’s Kilauea, the world’s longest-erupting volcano," 4 May 2018 Many residents of affluent Jefferson County say the jobs are not worth burning 84 tons of coal each day by a foreign manufacturer that wants to turn basalt, olivine sand and bauxite into super-efficient insulation. Patricia Sullivan, Washington Post, "Insulation plant divides community in West Virginia," 9 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'basalt.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of basalt

1601, in the meaning defined above

History and Etymology for basalt

Latin basaltes, manuscript variant of basanites touchstone, from Greek basanitēs (lithos), from basanos touchstone, from Egyptian bḫnw

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Statistics for basalt

Last Updated

23 Jul 2019

Look-up Popularity

Time Traveler for basalt

The first known use of basalt was in 1601

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More Definitions for basalt

basalt

noun

English Language Learners Definition of basalt

: a type of dark gray to black rock

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More from Merriam-Webster on basalt

Rhyming Dictionary: Words that rhyme with basalt

Spanish Central: Translation of basalt

Nglish: Translation of basalt for Spanish Speakers

Britannica.com: Encyclopedia article about basalt

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