Table of Contents
- 1 What type of rock is andesitic?
- 2 What are the 3 most common minerals in an andesite?
- 3 What is the mineral of andesitic?
- 4 What are the characteristics of andesitic rocks?
- 5 What is the chemical composition of granite and basalt?
- 6 Is andesite plutonic or volcanic?
- 7 What is the composition of the andesite rock?
- 8 Are there any other environments where andesite might form?
What type of rock is andesitic?
Andesite is a fine-grained, extrusive igneous or volcanic rock. It is dark grey and made up of equal amounts of light and dark minerals, although the crystals are too small to be seen without a magnifier. Occasionally andesite may contain some larger crystals.
What are the 3 most common minerals in an andesite?
Igneous rock composition chart: This chart shows that andesite is typically composed of plagioclase, amphiboles, and micas; sometimes with minor amounts of pyroxenes, quartz, or orthoclase.
What is composition of granite?
Granite is a light-colored plutonic rock found throughout the continental crust, most commonly in mountainous areas. It consists of coarse grains of quartz (10-50%), potassium feldspar, and sodium feldspar. Volcanic rock of equivalent chemical composition and mineralogy is called rhyolite. …
What is andesite mostly used for?
It is fairly strong, which allows it to be used in road and railway construction, and as fill gravel. The grayish colored rocks seen between railway ties are often andesite or its close relative, basalt. Perhaps the most interesting use of andesite is as proof of volcanic activity on Mars.
What is the mineral of andesitic?
Andesite is a gray to black volcanic rock with between about 52 and 63 weight percent silica (SiO2). Andesites contain crystals composed primarily of plagioclase feldspar and one or more of the minerals pyroxene (clinopyroxene and orthopyroxene) and lesser amounts of hornblende.
What are the characteristics of andesitic rocks?
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava. The mineral composition of andesite includes biotite, pyroxene, or amphibole.
What is peridotite chemical composition called?
doʊˌtaɪt, pəˈrɪd. ə-/ PERR-ih-doh-tyte, pə-RID-ə-) is a dense, coarse-grained igneous rock consisting mostly of the silicate minerals olivine and pyroxene. Peridotite is ultramafic, as the rock contains less than 45% silica.
What is characteristics of andesite?
What is the chemical composition of granite and basalt?
Granites and rhyolites consist predominantly of quartz and potash feldspar; gabbros and basalts, predominantly of pyroxene and plagioclase feldspar. Other rock types have intermediate mineral compositions.
Is andesite plutonic or volcanic?
Main types of igneous rocks
| Weight % of SiO2 | Plutonic rock type | Volcanic rock equivalent |
|---|---|---|
| 45-53 | Gabbro | Basalt |
| 53-63 | Diorite | Andesite |
| 63-68 | Granodiorite | Dacite |
| 68-75 | Granite | Rhyolite |
What is the economic importance of andesite?
Andesite may be used as aggregate or fill, but it is not ideal for concrete applications because it is high in silica, and causes alkali-silica reactivity in the concrete. Andesitic volcanism is associated closely with porphyry copper deposits and it is a host rock for much of the world’s copper ore.
What kind of uses can andesite be used for?
It is fairly strong, which allows it to be used in road and railway construction, and as fill gravel. The grayish colored rocks seen between railway ties are often andesite or its close relative, basalt. Perhaps the most interesting use of andesite is as proof of volcanic activity on Mars.
What is the composition of the andesite rock?
Andesite is a fine-grained rock that formed when the magma erupted onto the surface and crystallized quickly. Andesite and diorite have a composition that is intermediate between basalt and granite. This is because their parent magmas formed from the partial melting of a basaltic oceanic plate.
Are there any other environments where andesite might form?
There are many other environments where andesite might form. Hornblende Andesite Porphyry: A specimen of andesite with large visible hornblende phenocrysts. This type of rock could be called an “andesite porphyry” because of its texture. It could also be called a “hornblende andesite” because of its composition.
How is the composition of andesitic magma achieved?
To achieve andesitic composition via fractional crystallization, a basaltic magma must crystallize specific minerals that are then removed from the melt. This removal can take place in a variety of ways, but most commonly this occurs by crystal settling.