andesite
a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite.
Origin of andesite
1Other words from andesite
- an·de·sit·ic [an-duh-zit-ik], /ˌæn dəˈzɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use andesite in a sentence
After the cessation of the andesitic eruptions, a quiescent period of great length ensued.
The Yellowstone National Park | Hiram Martin ChittendenThey are often accompanied by volcanic rocks, which are mainly andesitic, and they commonly lie unconformably upon the older beds.
It is composed of andesitic lavas of the augite type, is pierced by many fumaroles, and has a crater in the solfatara stage.
The Solomon Islands and Their Natives | H. B. (Henry Brougham) GuppyAmongst them I may mention those of Bougainville Strait, which are composed of andesitic lavas of the hornblende type.
The Solomon Islands and Their Natives | H. B. (Henry Brougham) GuppyThese are characterized by igneous rocks of andesitic nature.
The Avifauna of Micronesia, Volume 3 | Rollin H. Baker
British Dictionary definitions for andesite
/ (ˈændɪˌzaɪt) /
a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene
Origin of andesite
1Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for andesite
[ ăn′dĭ-zīt′ ]
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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