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tholeiite

American  
[thoh-lee-ahyt, -luh-ahyt, toh-] / ˈθoʊ liˌaɪt, -ləˌaɪt, ˈtoʊ- /

noun

plural

tholeiites

  1. Geology. an iron-rich basalt-like igneous rock.

tholeiite Scientific  
/ tō′lə-īt′ /

  1. Any of a series of igneous rocks that are similar in composition to basalt, but are richer in silica and iron and poorer in aluminum than basalt is. Tholeiites form especially at mid-ocean ridges and in continental rift areas.

Other Word Forms

  • tholeiitic adjective

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.