Rhyolite: An extrusive igneous rock. Photos and definition.
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 rock.
Rhyolite - Wikipedia
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, …
Rhyolite Rock | Properties, Composition, Formation, Uses
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%).Due to the high silica content, rhyolite lava is very viscous. It is often difficult to identify rhyolites without chemical analysis due to …
Rhyolite | Igneous Rock | Britannica
rhyolite, extrusive igneous rock that is the volcanic equivalent of granite. Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion.
A Complete Guide to Rhyolite: A Common Light-colored Volcanic ...
2023年6月20日 · 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 Rock Facts: Geology and Uses - ThoughtCo
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.
4.1: Classification of Igneous Rocks - Geosciences LibreTexts
Figure 4.1.1 4.1. 1: Granite is a classic coarse-grained (phaneritic) intrusive igneous rock. The different colors are unique minerals. The black colors are likely two or three different minerals. If magma cools slowly, deep within the crust, the resulting rock is called intrusive or plutonic.