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rhyolite

[ rahy-uh-lahyt ]
/ ˈraɪ əˌlaɪt /
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noun

a fine-grained igneous rock rich in silica: the volcanic equivalent of granite.

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Origin of rhyolite

1865–70; rhyo- (irregular <Greek rhýax stream of lava) + -lite
rhy·o·lit·ic [rahy-uh-lit-ik], /ˌraɪ əˈlɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for rhyolite

rhyolite
/ (ˈraɪəˌlaɪt) /

noun

a fine-grained igneous rock consisting of quartz, feldspars, and mica or amphibole. It is the volcanic equivalent of granite
rhyolitic (ˌraɪəˈlɪtɪk), adjective
C19: rhyo- from Greek rhuax a stream of lava + lite
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

Scientific definitions for rhyolite

rhyolite
[ rīə-līt′ ]

A usually light-colored, fine-grained extrusive igneous rock that is compositionally similar to granite. It often includes flow lines formed during the extrusion.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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