Rhyolite is an extrusive felsic (silicic) volcanic rock. The high silica content and lower temperatures of rhyolite magma result in high viscosities and violent eruptive styles.
Rhyolite is rarely found as lava. Instead rhyolite tuff and ash falls are more common.
Texture: aphanitic
Composition: felsic (silicic), enriched in silica and depleted in iron and magnesium
Color: light gray or pink
Cooling Rate: fast, extrusive
Intrusive Equivalent: granite
Other Characteristics: tuffs commonly contain pumice and rock fragments.
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