andesite Hear it!

andesite definition

an·des·ite (an′də zīt′)

noun

a dark-colored, fine-grained, extrusive igneous rock consisting chiefly of plagioclase feldspars with some biotite, hornblende, or pyroxene

Etymology: after Andes (Mountains) + -ite

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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