igneous
Rhyolite
Extrusive felsic igneous rock
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, with pink, grey, or reddish colors and an aphanitic to porphyritic texture. It exhibits a dull to sub-vitreous luster.
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Physical properties
Hardness of 6 on the Mohs scale, with pink, grey, or reddish colors and an aphanitic to porphyritic texture. It exhibits a dull to sub-vitreous luster.
Formation & geological history
Formed from the rapid cooling of silica-rich lava at the Earth's surface, commonly associated with continental volcanic eruptions.
Uses & applications
Used locally as crushed stone for construction, road aggregate, and occasionally as an ornamental decorative stone.
Geological facts
Rhyolite is the extrusive volcanic equivalent of granite, sharing nearly identical mineralogy but possessing a much finer-grained crystal structure due to rapid cooling.
Field identification & locations
Identified by its fine-grained matrix, felsic composition, and frequent flow banding. Found in volcanic regions worldwide, including Yellowstone and Iceland.
