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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. It is generally light in color due to its low content of mafic minerals, and it is typically very fine-grained ( aphanitic ) or glassy .
Spherulites in rhyolitic ash, Hailstone Trail, Echo Canyon, Chiricahua Mountains, Arizona Spherulite markings on snowflake obsidian Photomicrograph of rhyolite, showing spherulitic texture (brown, between grey to white crystals) In petrology, spherulites (/ ˈ s f ɛr ʊ l aɪ t s, s f ɪər-/) are small, rounded bodies that commonly occur in ...
Thundereggs are found in flows of rhyolite lava.They form in the lava from the action of water percolating through the porous rock carrying silica in solution. The deposits lined and filled the cavity, first with a darker matrix material, then an inner core of agate or chalcedony.
Susquehanna broad projectile point from central New York State. Made from rhyolite, probably quarried near Gettysburg, Pennsylvania.. Susquehanna broad projectile points are stone projectile points manufactured by Native Americans in what is now the Northeastern United States, generally in the time interval of 1200–700 BC.
Rhyolite Mercantile, a general store built in 1906 that burned to the ground in September 2014 after being hit by lightning (image circa 2007). [2] The town is named for rhyolite, an igneous rock composed of light-colored silicates, usually buff to pink and occasionally light gray.
Volcanic clastic rock cobbles of rhyolite, in a sandstone matrix in this area are named Poway clasts. [2]The ancient Ballena River brought rhyolite-gravel, or "Poway" clasts, from a region in present-day Sonora, Mexico to the Pacific Ocean.
The upper section, formed by pyroclastic flow, is notated by pyroxene-bearing high-silica rhyolite pumice. [8] [9] The magma that formed the Bishop Tuff is suggested to be a "residual magma derived from some parental magma and not itself a primary or parental partial melt of common crustal rocks". [7]
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite. [1] Phenocrysts are sodic sanidine with minor albite and bipyramidal quartz. [2] The blue colour is caused by very small crystals of riebeckite or arfvedsonite. [3] The 1903 eruption of Changbaishan volcano in northeast China erupted comendite pumice. [4]