Rhyolite - Wikipedia
WEBRhyolite 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. [ 5 ]
Rhyolite: An extrusive igneous rock. Photos and definition. - Geology.com
WEBRhyolite is an extrusive igneous rock with a very high silica content. It is usually pink or gray in color with grains so small that they are difficult to observe without a hand lens. Rhyolite is made up of quartz, plagioclase, and sanidine, with minor amounts of …
Rhyolite | Igneous Rock | Britannica
WEBrhyolite, extrusive igneous rock that is the volcanic equivalent of granite. Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion.
Rhyolite Rock | Properties, Composition, Formation, Uses
WEBMar 13, 2023 · Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz (>20%) and alkali feldspar (>35%).Due to the high silica content, rhyolite lava is very viscous. It is often difficult to identify rhyolites without chemical analysis due to their glassy groundmasses.
Rhyolite Rock Facts: Geology and Uses - ThoughtCo
WEBMar 19, 2019 · Rhyolite is an extrusive, silica-rich igneous rock. Rhyolite has a similar composition and appearance to granite. However, rhyolite forms as a result of a violent volcanic eruption, while granite forms when magma solidifies beneath the Earth's surface.
A Complete Guide to Rhyolite: A Common Light-colored Volcanic …
WEBJun 20, 2023 · Rhyolite is a light-colored, fine-grained, or glassy volcanic (extrusive igneous) rock. It is a silica-rich, felsic rock (high in light-colored minerals like quartz and feldspars) and low in mafic minerals. Rhyolite rock is usually pinkish to light gray but can be buff (pale brownish yellow), yellowish, reddish, bluish-gray, or reddish purple.
Rhyolite Definition & Meaning - Merriam-Webster
WEBAug 14, 2024 · The meaning of RHYOLITE is a very acid volcanic rock that is the lava form of granite.
Rhyolite - Geology 1501 - ECU
WEBRhyolite. Type. Igneous Rock. Texture. Aphanitic (Fine-grained) Origin. Extrusive/Volcanic. Chemical Composition. Felsic.
Rhyolite - HyperPhysics
WEBRhyolite is an igneous rock in the class designated as "felsic" rock. This class of rock crystallizes from silicate minerals at relatively low temperatures and with relatively a high percentage of silica . It is at the low temperature extreme of the Bowen reaction series.
Pictures and Descriptions of Igneous Rock Types - ThoughtCo
WEBJun 2, 2019 · Rhyolite is a high-silica volcanic rock that is chemically the same as granite but is extrusive rather than plutonic. Click the photo for the full-size version. Rhyolite lava is too stiff and viscous to grow crystals except for isolated phenocrysts.