tholeiite(redirected from Tholeiitic basalt)
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Related to Tholeiitic basalt: subalkaline
Any of a series of igneous rocks similar in composition to basalt but having more silica and iron and less aluminum.
[After Tholei (Tholey), municipality in Saarland, Germany, where it is found.]
tho′lei·it·ic (-ĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a type of igneous or volcanic rock found on the ocean floor that is rich in aluminium and similar to basalt
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014