Any of a group of igneous rocks composed mainly of olivine and various pyroxenes and having a granitelike texture.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "peridotite" in a sentence
"C peridotite and dunite the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes."
"Geologist Peter Kelemen and fellow scientists from the Earth Institute at Columbia University went to Oman and discovered that a special kind of rock called peridotite has the potential to suck up billions of pounds of CO2."
"It is a unique type of rock, peridotite, which is normally found only much deeper in the earth, but which juts up to the mantel in the Atlantic massif."