They have different compositions. Most igneous rocks fall into a spectrum ranging from mafic (low silica, dominated by iron, magnesium, and calicum) to felsic (high silica, dominated by sodium and potassium)
On this scale rhyolite is felsic while andesite is intermediate. Rhyolite is dominated by the presence of quartz, potassium feldspar, and sodium-rich plagioclase. Rhyolite also tends to contain more volcanic glass. Common colors of rhyolite are light gray, white, and pink. Andesite often contains plagioclase with a fiar balance of sodium and potassium. Plagioclase is also a common dominant mineral. Andesite is darker than rhyolite, ranging from gray to almost black.
Rhyolite is the most felsic rock out of rhyolite, andesite, and basalt. Felsic rocks have a higher silica content and are associated with continental crust. Rhyolite is typically light in color and has a high silica content, making it more felsic compared to andesite and basalt.
The main difference between dacite and andesite lies in their silica content. Dacite has a higher silica content than andesite, making it more viscous. Dacite also typically contains more quartz and less mafic minerals than andesite.
Felsic, high in silica. Mafic, low in silica. Intrusive, those formed underground. Extrusive, those formed above ground.
Some different types of lava rocks include basalt, andesite, rhyolite, and obsidian. Basalt is the most common type and is dark in color with a fine-grained texture, while andesite is similar but contains more silica. Rhyolite is light in color with a high silica content, and obsidian is a dark, glassy rock formed from rapidly cooled lava.
The melting point of rhyolite can vary depending on its composition and mineral content, but typically ranges from 700 to 900 degrees Celsius. Rhyolite is a silica-rich volcanic rock that usually melts at higher temperatures compared to basalt or andesite.
The composition of the rock will determine whether it is a rhyolite or an andesite.
Rhyolite is the most felsic rock out of rhyolite, andesite, and basalt. Felsic rocks have a higher silica content and are associated with continental crust. Rhyolite is typically light in color and has a high silica content, making it more felsic compared to andesite and basalt.
Ignimbrite, Andesite, Basalt, Rhyolite
a dark, fine-grained, brown or grayish volcanic rock that is intermediate in composition between rhyolite and basalt.
It varies in composition, but is usually andesite, dacite, or rhyolite.
You find rhyolite rock wherever you find andesite volcanoes or extinct andesite volcanoes. Topaz Mountain in western Utah (3 hours west of Provo) is a rhyolite mountain complete with garnet, topaz crystals, beryl, and other gemstones and minerals. If there are no dormant or extinct volcanoes in your area, your chances of finding rhyolite are slim to none.
Both rhyolite and andesite typically contain the minerals quartz, feldspar (particularly plagioclase and alkali feldspar), and biotite. They may also contain other minerals such as hornblende or pyroxene, though these are more variable. The presence of these minerals contributes to their characteristic compositions and textures. Rhyolite is generally more silica-rich than andesite, resulting in differences in mineral proportions.
Peridotite, andesite, pumice, rhyolite, obsidian, granite, and basalt.
diorite,gabbro,granite,obsidean,pumice,rhyolite,andesite
Basalt, Andesite, Rhyolite, Obsidian, Pumice, Tuff, Ash (Lava).
Volcanic rocks are extrusive igneous rocks.
basalt, granite, rhyolite, andesite, gabbro, obsidian, scoria, pumice.