Andesite Definition

ăndĭ-zīt
noun
A gray, fine-grained volcanic rock consisting chiefly of plagioclase feldspar and one or more mafic minerals.
American Heritage
A dark-colored, fine-grained, extrusive igneous rock consisting chiefly of plagioclase feldspars with some biotite, hornblende, or pyroxene.
Webster's New World

(geology) A class of fine-grained intermediate igneous rock, of volcanic origin, containing mostly plagioclase feldspar.

Wiktionary

Other Word Forms of Andesite

Noun

Singular:
andesite
Plural:
andesites

Origin of Andesite

  • After the Andes

    From American Heritage Dictionary of the English Language, 5th Edition

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andesite