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.

Jan 16, 2026 · Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz (>20%) and alkali feldspar (>35%)

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 …

Nov 7, 2025 · Discover rhyolite rock: its formation, identification, history, and modern uses from tools to jewelry. Learn how this versatile rock is used worldwide.

Rhyolite is an extrusive igneous rock formed from the rapid cooling of high-silica magma at or near the Earth's surface during volcanic eruptions. It is the volcanic equivalent of granite, sharing a similar …

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.