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 Rock | Properties, Composition, Formation, Uses
WEBMar 13, 2023 — A group of extrusive igneous rocks, typically porphyritic and commonly exhibiting flow texture, with phenocrysts of quartz and alkali feldspar in a glassy to cryptocrystalline groundmass; also, any rock in that group; the extrusive equivalent of …
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 | 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 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.
Rhyolite: Identification, Pictures & Info for Rockhounds
WEBRhyolite is an extrusive, aphanitic (fine-grained), light-colored (felsic) igneous rock consisting of between 20-90% quartz, less than 15% dark-colored minerals, and feldspar. Alkali feldspar makes up 35 to 100% of the total feldspar content. Rhyolite may contain some larger crystals know as phenocrysts.
All About Rhyolite – Uses, Properties, Color, and Worth
WEBMar 6, 2021 — Rhyolite is an extrusive igneous rock and is high in silica content. This fine grained igneous rock will typically contain the minerals quartz, plagioclase, and sanidine with lesser amounts of biotite and hornblende. Rhyolite is …
Rhyolite - Pinal Geology and Mineral Museum
WEBAug 17, 2023 — Rhyolite is an extrusive igneous rock that forms from the rapid cooling and solidification of lava on the Earth’s surface. It is chemically equivalent to the plutonic rock granite, but its fine-grained texture results from its rapid cooling during volcanic eruptions.
Rhyolite | OpenLearn - Open University
WEBSep 27, 2006 — Rhyolite is a fine-grained extrusive igneous rock or volcanic rock. It is pale coloured, often light grey, tan or pinkish. Rhyolite is made up of quartz and feldspar crystals, and occasionally contains some mafic (dark coloured) minerals.