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.
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