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A fine-grained extrusive volcanic rock, similar to granite in composition and usually exhibiting flow lines.

[Greek rhuāx, stream (from rhein, to flow; see sreu- in Indo-European roots) + -lite.]


(Geological Science) 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]
rhyolitic adj


(ˈraɪ əˌlaɪt)

a fine-grained igneous rock rich in silica: the volcanic equivalent of granite.
[1865–70; rhyo- (irreg. < Greek rhýax stream of lava) + -lite]
rhy`o•lit′ic (-ˈlɪt ɪk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.rhyolite - very acid volcanic rockrhyolite - very acid volcanic rock    
igneous rock - rock formed by the solidification of molten magma
References in periodicals archive ?
TSX-V: REX)("Orex"), is pleased to announce that early surface work on the Sandra Escobar Silver Project in Durango, Mexico, has confirmed highly anomalous silver mineralization related to a rhyolite dome complex in the southeast sector.
For nine months Dr Bevins and Dr Ixer collected and identified samples from Pembrokeshire's rock outcrops to try to find the origins of rhyolite debitage rocks that can be found at Stonehenge.
Baragiola, a professor of engineering physics in the University of Virginia School of Engineering and Applied Science set up experiments to measure ozone produced by crushing or drilling into different igneous and metamorphic rocks, including granite, basalt, gneiss, rhyolite and quartz.
Extensive mineralized system controlled by NE and NW structures, favourable host rocks and subsurface rhyolite domes
intersected a wide section of high silica rhyolite with chalcopyrite
We believe the favorable mineralogy and the 67% heavy to light rare earth ratios in samples from the deposit may offer attractive targets ranging from a one billion ton plus bulk low grade mineable deposit hosted in the Round Top rhyolite intrusive, to more conventional higher grade targets hosted deeper in the intrusive and in the carbonate wall rocks.
335 Ma Cumberland Hill Formation of southern New Brunswick consist of peralkaline rhyolite and trachyte.
Next on our list was a tour of the ghost-mining town Rhyolite, which got its name from the silica-rich volcanic rock in the area.
The old house's rhyolite stone walls were retained and became an integral component of the new facility.
The northernmost exposure shows rhyolite in contact with Bonneterre Formation (el.
Underfoot, basalt, rhyolite, cinder crust, obsidian.