See soorce fer Rhyolite

{{Infobox rock
|name=Rhyolite
|type=Igneous
|image=RhyoliteUSGOV.jpg
|caption=
|composition=Felsic: igneous quartz an alkali feldspar ([[orthoclase]], [[sanidine]] an sodic [[plagioclase]]), biotite an hornblende.
}}
'''Rhyolite''' is an [[igneous rock|igneous]], [[volcanic rock]], o [[felsic]] ([[silica]]-rich) composeetion (teepically > 69% SiO<sub>2</sub>—see the [[TAS classification]]). It mey hae ony texture frae [[glassy]] tae [[aphanitic]] tae [[porphyritic]]. The [[mineral]] assemblage is uisually [[quartz]], [[alkali feldspar]] an [[plagioclase]] (in a ratio > 1:2—see the [[QAPF diagram]]). [[Biotite]] an [[hornblende]] are common accessory minerals.

[[Category:Aphanitic rocks]]
[[Category:Felsic rocks]]
[[Category:Porphyritic rocks]]
[[Category:Volcanic rocks]]
[[Category:Subvolcanic rocks]]
[[Category:Volcanology]]