Rhyolite - Wikipedia 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: Formation, Types, Uses, and Care for this Volcanic Rock Explore the world of rhyolite, a fine-grained volcanic rock formed from silica-rich magma Learn about its formation, types, uses in construction and art, and how to care for it in this comprehensive guide
A Complete Guide to Rhyolite: A Common Light-colored Volcanic Rock 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 content
Rhyolite | Igneous Rock | Britannica Rhyolite, extrusive igneous rock that is the volcanic equivalent of granite Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion
Rhyolite: Identification, Pictures Info for Rockhounds 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
Rhyolite - Geology 1501 - ECU Type Igneous Rock Texture Aphanitic (Fine-grained) Origin Extrusive Volcanic Chemical Composition Felsic Color Light Gray Mineral Composition Potassium Feldspar, Quartz, Sodium Plagioclase, Biotite, Hornblende Miscellaneous Flow banding Tectonic Environment Convergent Boundary – Andean-type subduction zones, intracontinental hot spots and rifts
USGS: Volcano Hazards Program Glossary - Rhyolite 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-silica rhyolite contains 75 to 80 percent silica
Geology - rocks and minerals 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