EXAMPLES | WORD ORIGIN noun a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite. Origin of andesite 1840–50;
-ite 1 Related forms an·de·sit·ic , [an-d uh- zit-ik] /ˌæn dəˈzɪt ɪk/ adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for andesitic Historical Examples of andesitic
These are characterized by igneous rocks of
The building fronts the west, and is constructed of an
andesitic tuff of inferior quality and dark colour.
Great masses of granite, syenite and diorite were intruded at this period, and send tongues even into the
It is composed of
andesitic lavas of the augite type, is pierced by many fumaroles, and has a crater in the solfatara stage.
Amongst them I may mention those of Bougainville Strait, which are composed of
andesitic lavas of the hornblende type. British Dictionary definitions for andesitic noun a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene Word Origin for andesite
Andes + -ite 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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A gray, fine-grained volcanic rock. Andesite consists mainly of sodium-rich plagioclase feldspar and one or more mafic minerals such as biotite, hornblende, or pyroxene. It often contains small, visible crystals (phenocrysts) of plagioclase.
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