1) Aphanitic rock 2) Igneous rock 3) Volcanic rock 4) Volcanic rock
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fine-grained igneous rock of intermediate composition. Up to half of the rock is plagioclase feldspar with the rest being ferromagnesian minerals.
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http://en.wikipedia.org/wiki/Glossary_of_geology
Intermediate volcanic rocks containing 54 to 62 percent silica and moderate amounts of iron and magnesium. Andesite minerals commonly include plagioclase and hornblende, with lesser amounts of mica, pyroxene, and various accessory minerals. Andesites are aphanitic in texture and are usually medium dark in color. They occur with composite volcanic c...
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http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html
Volcanic rock (or lava) characteristically medium dark in color and containing 54 to 62 percent silica and moderate amounts of iron and magnesium.
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• (n.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene.
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http://thinkexist.com/dictionary/meaning/andesite/
any member of a large family of rocks that occur in most of the world`s volcanic areas. Andesites occur mainly as surface deposits and, to a lesser ... [2 related articles]
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http://www.britannica.com/eb/a-z/a/71
Close view of andesite lava flow Brokeoff Volcano, California. Credit: U.S. Geological Survey A dark-colored, fine-grained extrusive igneous rock with about 52 to 63 percent by weight of silica (SiO
2). Andesites contain crystals composed primarily of plagioclase feldspar...
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The dark, aphanitic, extrusive rock that has a silica content of about 60% and is the second most abundant volcanic rock. Andesites are found in large quantities in the Andes Mountains
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A fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as ho
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http://www.encyclo.co.uk/local/22392
An'des·ite noun (Min.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene.
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http://www.encyclo.co.uk/webster/A/80
A fine-grained igneous rock composed mostly of plagioclase feldspar and from 25% to 40% amphibole and biotite, but no quartz or K-feldspar. It is abundant in mountains bordering the Pacific Ocean, such as the Andes Mountains of South America, from which the name was derived. Andesitic magma is believed to originate from fractionation of partially m...
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http://www.evcforum.net/WebPages/Glossary_Geology.html
An extrusive igneous rock that develops from a magma that is chemically between felsic and mafic and whose mineral crystals are fine.
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http://www.physicalgeography.net/physgeoglos/a.html
Andesite is a crystalline igneous rock, occurring mostly in lava flows, but sometimes in dykes and veins. It consists principally of plagioclase feldspar, and is often porphyritic, showing large crystals of feldspar scattered through a fine-grained mass, usually of small feldspar crystals, but often containing much glassy material. Andesite forms m...
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Igneous volcanic rock (~60% SiO2), less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite.
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http://www.scientificpsychic.com/etc/geology-glossary.html
Igneous volcanic rock, less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite.
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http://www.ucmp.berkeley.edu/glossary/gloss2geol.html
Igneous volcanic rock, less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite.
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http://www.ucmp.berkeley.edu/glossary/glossary_2.html
a variety of volcanic rock.
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noun a dark grey volcanic rock
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Volcanic igneous rock, intermediate in silica content between rhyolite and basalt. It is characterized by a large quantity of feldspar minerals, giving it a light colour. Andesite erupts from volcanoes at destructive plate margins (where one plate of the Earth's surface moves beneath another; see plate tectonics), including the Andes, from ...
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A type of magma with intermediate viscosity and silica content. Forms large composite volcanoes, sometimes called stratovolcanoes, made up of alternating ash and lava layers, such as Mt. Ruapehu. Andesite is also the name given to the volcanic rock formed from andesite magma.
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https://www.encyclo.co.uk/local/21337
A fine-grained volcanic rock of intermediate composition, consisting largely of plagioclase and one or more mafic minerals.
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https://www.encyclo.co.uk/local/22327
a variety of volcanic rock.
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https://www.encyclo.co.uk/local/22710
Andesite is an extrusive igneous rock consisting primarily of plagioclase feldspars plus pyroxene and/or hornblende . Biotite , magnetite , quartz and sphene are common constituents.
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https://www.encyclo.co.uk/local/23719
Igneous rock, fine-grained, grey-coloured, formed from a fairly viscous type of lava.
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https://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle/page3451.h
a dark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite.
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https://www.infoplease.com/dictionary/andesite
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