andesite

[ an-duh-zahyt ]

/ ˈæn dəˌzaɪt /

noun

a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite.

Nearby words

andersonville, anderssen, andes, andes lightning, andesine, andesite, andhra pradesh, andiamo, andie, andijon, andikithira

Origin of andesite

1840–50; named after Andes; see -ite¹

Related forms

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. 2019

Examples from the Web for andesitic

Amongst 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) Guppy
After the cessation of the andesitic eruptions, a quiescent period of great length ensued.
The Yellowstone National Park|Hiram Martin Chittenden
These are characterized by igneous rocks of andesitic nature.
The Avifauna of Micronesia, Volume 3|Rollin H. Baker
The building fronts the west, and is constructed of an andesitic tuff of inferior quality and dark colour.
Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 3|Various

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) Guppy

British Dictionary definitions for andesitic

andesite

/ (ˈændɪˌzaɪt) /

noun

a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene

Word Origin for andesite

C19: from Andes + -ite 1

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for andesitic

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.