[ rahy-uh-lahyt ]
/ ˈraɪ əˌlaɪt /


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

Origin of rhyolite

1865–70; rhyo- (irregular < Greek rhýax stream of lava) + -lite

Related forms

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. 2019

Examples from the Web for rhyolite

British Dictionary definitions for rhyolite


/ (ˈraɪəˌlaɪt) /


a fine-grained igneous rock consisting of quartz, feldspars, and mica or amphibole. It is the volcanic equivalent of granite

Derived Forms

rhyolitic (ˌraɪəˈlɪtɪk), adjective

Word Origin for rhyolite

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

Science definitions for 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.