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 basalt (audio) \ adjective

Examples of basalt in a Sentence

Recent Examples on the Web His experiments using silicon oil—a proxy for basalt, a commonplace runny magma—showed that if just 3 percent of an oil-particle mixture is made of nano-size particles, the viscosity spikes. Robin George Andrews, Wired, 6 June 2021 His experiments using silicon oil — a proxy for basalt, a commonplace runny magma — showed that if just 3% of an oil-particle mixture is made of nano-size particles, the viscosity spikes. Quanta Magazine, 1 June 2021 Dirt trails lead past basalt rock formations and old-growth stands of juniper trees, while Cascade peaks rise up from the horizon. oregonlive, 3 June 2021 This roundtrip cruise from Reykjavik includes five ports of call that show-off Iceland’s gorgeous, varied landscapes of glaciers, fjords, volcanic rock, basalt pillars and soaring geysers. Mike Espindle, Forbes, 20 May 2021 That dam was built in the 1960s beside the freeway, impounding water over a basalt lava flow whose soils don’t contain water well, according to the BLM. Brian Maffly, The Salt Lake Tribune, 28 Apr. 2021 What put Cannon Beach on the map is distinctive Haystack Rock, a basalt tower shooting 235 feet from the water's edge. Anne Olivia Bauso, Travel + Leisure, 25 Apr. 2021 Originating as an entry in Düsseldorf’s Documenta art exhibition, the action turned into a years-long project involving the planting of thousands of trees, accompanied by sculptural basalt stones. J.s. Marcus, WSJ, 26 Mar. 2021 Two of the bacteria species struggled to extract metals from their basalt samples. Theresa Machemer, Smithsonian Magazine, 13 Nov. 2020

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

19 Jun 2021

Cite this Entry

“Basalt.” Dictionary, Merriam-Webster, Accessed 22 Jun. 2021.

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More Definitions for basalt



English Language Learners Definition of basalt

: a type of dark gray to black rock

More from Merriam-Webster on basalt

Nglish: Translation of basalt for Spanish Speakers Encyclopedia article about basalt


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