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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 ?
As we all know, what goes up must come down; Rhyolites quick influx of businesses, residents, and financial success was short lived.
While the felsic dykes are apparently related to the granite, the mutual relations between the granite, mafic and rhyolite sheets are yet to be deciphered, but the rhyolites may represent melts derived from the crust through underplating by mafic magma.
Finally, spectral angle mapper (SAM), supervised maximum-likelihood classifications (MLL) and Mixture-Tuned Matched Filtering (MTMF) were performed on the VNIR and SWIR data to map rhyolites, alluvium, sandstone, shale and carbonates.
It has long been suspected that rhyolites from the northern Preseli Hills helped build the monument, which is a Unesco World Heritage Site, but this is the first time an exact source has been found for any of the stones there.
The Mogote Granite was intruded during the Taconic orogeny whereas the Mata Oscura and Pinero granites, as well as the Corcovado and Segoviera rhyolites, fall at the end of the Appalachian orogeny.
This stage is marked by an enigmatic type of rock -- red granites and rhyolites -- appearing in a broad belt that stretches several thousand miles from southern California to Labrador.
However, should we be successful in developing a method to process the Round Top rhyolite, it is likely that this process would be applicable to the other mineralogically similar rhyolites masses.
Aeromagnetic surveying will help to define the form and geometry of the mineralized rhyolites and to detect the presence of other rhyolite bodies which may be hidden under cover.
These features includes : Thickening (25 to 200 m) of the rhyolitic units; Hydrothermal alteration of the rhyolites (Ishikawa Index > 80 %); Existence of favorable horizons (exhalites); Existence of massive sulphides grading: 11.
Dan Gorski, Chief Operating Officer noted, "Aeromagnetic surveying is planned to define the form and geometry of the mineralized rhyolites and to detect the presence of other rhyolite bodies which may be hidden under cover.
This series, interpreted as a calc-alkaline continental-type volcano-sedimentary unit (Andean-type), exhibits bimodal volcanism, with basalts, andesites, dacites and rhyolites.