Rhyolite is an igneous, volcanic rock, of felsic (silica-rich) composition (typically > 69% SiO2—see the TAS classification). source
Rhyolite is an igneous, volcanic rock, of felsic (silica-rich) composition (typically > 69% SiO2—see the TAS classification).
Rhyolite may have any texture from glassy to aphanitic to porphyritic. source
Rhyolite may have any texture from glassy to aphanitic to porphyritic.
Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock. source
Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock.
Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas. source
Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas.
Rhyolite occur as breccias or in volcanic plugs and dikes. source
Rhyolite occur as breccias or in volcanic plugs and dikes.
Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian. source
Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian.
Some rhyolite is highly vesicular pumice. source
Some rhyolite is highly vesicular pumice.
Many eruptions of rhyolite are highly explosive and the deposits may consist of fallout tephra/tuff or of ignimbrites. source
Many eruptions of rhyolite are highly explosive and the deposits may consist of fallout tephra/tuff or of ignimbrites.
Eruptions of rhyolite are relatively rare compared to eruptions of less felsic lavas. source
Eruptions of rhyolite are relatively rare compared to eruptions of less felsic lavas.
Only three eruptions of rhyolite have been recorded since the start of the 20th century. source
Only three eruptions of rhyolite have been recorded since the start of the 20th century.
The Gondwana Rainforests of Australia World Heritage Area contains rhyolite-restricted flora along the Great Dividing Range source
The Gondwana Rainforests of Australia World Heritage Area contains rhyolite-restricted flora along the Great Dividing Range
The name rhyolite was introduced into geology in 1860 by the German traveler and geologist Ferdinand von Richthofen. source
The name rhyolite was introduced into geology in 1860 by the German traveler and geologist Ferdinand von Richthofen.
In North American pre-historic times, rhyolite was quarried extensively in eastern Pennsylvania in the United States. source
In North American pre-historic times, rhyolite was quarried extensively in eastern Pennsylvania in the United States.
Among the leading quarries was the Carbaugh Run Rhyolite Quarry Site in Adams County, where as many as fifty small quarry pits are known. source
Among the leading quarries was the Carbaugh Run Rhyolite Quarry Site in Adams County, where as many as fifty small quarry pits are known.
Rhyolite, Nevada was named after a rhyolite deposit that characterised the area. source
Rhyolite, Nevada was named after a rhyolite deposit that characterised the area.
