rhyolite

Rhyolite is a type of igneous volcanic rock that forms from fast-cooling magma rich in silica. It is typically light-colored, often pink, gray, or white, and has a fine-grained or glassy texture. Rhyolite is similar in composition to granite but cools rapidly on the Earth's surface or near-surface, resulting in its finer texture. It often forms during volcanic eruptions with high silica content, leading to explosive activity. Rhyolite deposits are valuable for understanding volcanic processes and sometimes contain minerals like quartz and feldspar.