an·​des·​ite ˈan-di-ˌzīt How to pronounce andesite (audio)
: an extrusive usually dark grayish rock consisting essentially of oligoclase or feldspar
andesitic adjective

Examples of andesite in a Sentence

Recent Examples on the Web Much of the area around the caldera is covered by basaltic andesite lava flows related to the magmatic system at Newberry, erupting as fissures and cinder cones along faults that cross the area. Erik Klemetti, Discover Magazine, 17 June 2024 It is carved from augite andesite, a dark black porous volcanic stone, according to the release. Irene Wright, Miami Herald, 13 May 2024 What looked like a sacrificial table of white sandstone, surrounded by andesite blocks, prompted Quisbert to speak of capacocha, an Inca ritual in which children of both sexes were selected for sacrifice. Aatish Taseer, New York Times, 9 Nov. 2023 The andesite magma from El Chichón has about 2.6 weight percent SO3, many times more than most magmas. Erik Klemetti, Discover Magazine, 28 Mar. 2012 The pre-1980 cone, which took shape in just the past 2,500 years, consisted in part of mountain-building andesite rocks. Steve Olson, Scientific American, 1 Nov. 2017 The main cone is made of andesite, dacite, and rhyodacite. Jennifer Earl, Fox News, 16 May 2018

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'andesite.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


German Andesit, from Andes

First Known Use

1837, in the meaning defined above

Time Traveler
The first known use of andesite was in 1837

Dictionary Entries Near andesite

Cite this Entry

“Andesite.” Dictionary, Merriam-Webster, Accessed 21 Jul. 2024.

Kids Definition


an·​des·​ite ˈan-di-zīt How to pronounce andesite (audio)
: a usually dark grayish rock of feldspar that is formed from lava
andesitic adjective

More from Merriam-Webster on andesite

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