andesite

andesite

[an-duh-zahyt]
noun
a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite.

Origin:
1840–50; named after Andes; see -ite1

andesitic [an-duh-zit-ik] , adjective
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Collins
World English Dictionary
andesite (ˈændɪˌzaɪt)
 
n
a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene
 
[C19: from Andes + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
andesite   (ān'dĭ-zīt')  Pronunciation Key 
A gray, fine-grained volcanic rock. Andesite consists mainly of sodium-rich plagioclase and one or more mafic minerals such as biotite, hornblende, or pyroxene. It often contains small, visible crystals (phenocrysts) of plagioclase. It is the fine-grained equivalent of diorite.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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