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

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

rhyolitic [rahy-uh-lit-ik] , adjective
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World English Dictionary
rhyolite (ˈraɪəˌlaɪt)
a fine-grained igneous rock consisting of quartz, feldspars, and mica or amphibole. It is the volcanic equivalent of granite
[C19: rhyo- from Greek rhuax a stream of lava + lite]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
rhyolite   (rī'ə-līt')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Rhyolite is what all these little chips are made of scattered on the ground.
The rock capping the mesa is an extrusive form of granite called rhyolite.
Rhyolite is present as two distinct compositional and genetic types.
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