Rhyolite is an extrusive igneous rock, formed from magma rich in silica that is extruded from a volcanic vent to cool quickly on the surface rather than slowly in the subsurface.

Rhyolite is an extrusive igneous rock formed during eruptions of granitic magma. Pumice, obsidian, and tuff are associated rock types.

Jun 20, 2023 · Rhyolite is a highly silicic, fine-grained, light-colored volcanic or extrusive igneous rock. It is a felsic rock with mainly quartz, alkali feldspar, plagioclase, and minor ferromagnesian minerals …

Rhyolite, extrusive igneous rock that is the volcanic equivalent of granite. Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion.

Apr 11, 2018 · Rhyolite has the mineralogical composition of granite. Rhyolite rocks can be found in many countries including New Zealand, Germany, Iceland, India, and China, and the deposits can be …

Aug 28, 2025 · Rhyolite is a volcanic rock that forms from rapidly cooling lava. It provides insights into explosive volcanic activity and the geological history of various regions. This article explores its …

Rhyolite Volcanic rock (or lava) that characteristically is light in color, contains 69 or more percent of silica, and is rich in potassium and sodium. Low-silica rhyolite contains 69 to 74 percent silica. High …

Rhyolite is a felsic extrusive rock. Due to the high silica content, rhyolite lava is very viscous. It flows slowly, like tooth paste squeezed out of a tube, and tends to pile up and form lava domes.

Type Igneous Rock Texture Aphanitic (Fine-grained) Origin Extrusive/Volcanic Chemical Composition Felsic Color Light Gray Mineral Composition Potassium Feldspar, Quartz, Sodium Plagioclase, …

Rhyolite is an extrusive, aphanitic (fine-grained), light-colored (felsic) igneous rock consisting of between 20-90% quartz, less than 15% dark-colored minerals, and feldspar.