What is the description of rhyolite?
Definition of rhyolite : a very acid volcanic rock that is the lava form of granite.
What are the characteristics of 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.
Is rhyolite coarse or fine grained?
Rhyolite is the aphanitic (fine-grained) extrusive equivalent of granite.
What is the texture of rhyolite?
Rhyolite is extrusive equivalent of granite magma. It is composed predominantly of quartz, K–feldspar and biotite. It may have any texture from glassy, aphanitic, porphyritic, and by the orientation of small crystals reflecting the lava flow.
What is the color and texture of rhyolite?
Most rhyolites are uniform in texture, and their color ranges from gray to light-pink, depending on the striations made by the lava flow. These rocks have many shapes, ranging from pumice to porphyritic.
What is the structure of rhyolite?
What is the rhyolite texture?
What is the fine-grained equivalent of rhyolite?
Porphyritic. Rhyolite is the fine-grained equivalent of this igneous rock.
What’s the texture of rhyolite?
What is rhyolite grain size?
Grain Size fine grained, sometimes porphyric.
What is the crystal size of rhyolite?
Spherulites are generally less than 0,5 cm in diameter, but they may reach a meter or more across. They form by very rapid growth in quickly cooling magma, and the crystallization of glass.
What are the main features of rhyolite?
Introduction Features Igneous rocks Sedimentary rocks Metamorphic rocks. Rhyolite is a felsic extrusive rock. Due to the high silica content, rhyolite lava is very viscous. It flows slowly, like tooth paste squeezed out of a tube, and tends to pile up and form lava domes.
What is the scientific name for rhyolite?
Rhyolite. From Wikipedia, the free encyclopedia. Jump to navigation Jump to search. For other uses, see Rhyolite (disambiguation). An igneous, volcanic rock, of felsic (silica-rich) composition. Rhyolite. Igneous rock. #N#Composition. Felsic: igneous quartz and alkali feldspar ( sanidine and sodic plagioclase ), biotite and hornblende.
What is rhyolite in the TAS diagram?
Rhyolite is high in silica and total alkali metal oxides, placing it in the R field of the TAS diagram. : 140–146 The alkali feldspar in rhyolites is sanidine or, less commonly, orthoclase. It is rarely anorthoclase.
How common is rhyolite in the ocean?
Rhyolite is more common when the overriding lithosphere is continental rather than oceanic. The thicker continental crust gives the rising magma more opportunity to differentiate and assimilate crustal rock. Rhyolite has been found on islands far from land, but such oceanic occurrences are rare.