Rhyolite - Wikipedia
网页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. [5]
A Complete Guide to Rhyolite: A Common Light-colored Volcanic …
网页2023年6月20日 · Rhyolite is a highly silicic, fine-grained, light-colored volcanic or extrusive igneous rock. It is a felsic rock with mainly quartz, alkali feldspar, plagioclase, and minor ferromagnesian minerals content. The word rhyolite comes from the Greek word rhýax, which means a stream of lava, while the suffix lite means a rock. Ferdinand von ...
Rhyolite Rock | Properties, Composition, Formation, Uses
网页2023年3月13日 · Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz (>20%) and alkali feldspar (>35%)
Rhyolite: An extrusive igneous rock. Photos and definition. - Geology.com
网页What is Rhyolite? Rhyolite 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 hornblende and biotite. Trapped gases often produce vugs in the ...
Rhyolite | Igneous Rock | Britannica
网页Rhyolite, extrusive igneous rock that is the volcanic equivalent of granite. Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion. Crystallization may sometimes have begun while the magma was deeply buried; in such cases, the rock may consist principally of
Rhyolite: Identification, Pictures & Info for Rockhounds
网页Rhyolite 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 Rock Facts: Geology and Uses - ThoughtCo
网页2019年3月19日 · 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 - Geology 1501 - ECU
网页Type Igneous Rock Texture Aphanitic (Fine-grained) Origin Extrusive/Volcanic Chemical Composition Felsic Color Light Gray Mineral Composition Potassium Feldspar, Quartz, Sodium Plagioclase, Biotite, Hornblende Miscellaneous Flow banding Tectonic Environment Convergent Boundary – Andean-type subduction zones, intracontinental hot spots and rifts
Rhyolite - an overview | ScienceDirect Topics
网页Rhyolite is an extrusive igneous rock that is the equivalent of granite magma, composed mainly of quartz, K-feldspar, and biotite. It can have various textures, such as glassy, aphanitic, and porphyritic, and is often characterized by sanidine and rare quartz, plagioclase, and biotite.
Rhyolite - SpringerLink
网页Rhyolite is a fine-grained or glassy igneous rock chemically and mineralogically the volcanic equivalent of granite. The name was originally applied to such rocks by von Richthofen (1860, see Johannsen, 1932) on account of the frequently displayed flow banding (prefix rhyo-, from Greek rhyox, stream of lava).