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Andesite is common in most of the world's volcanic areas. Andesites occur mainly as surface deposits and, to a lesser extent, as dikes and small plugs. ... Andesite most commonly is fine-grained, usually porphyritic. In composition, andesites correspond roughly to the intrusive igneous rock diorite and consist essentially...
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geology.csupomona.edu/alert/igneous/andesite.htm
geology.csupomona.edu/alert/igneous/andesite.htm
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Andesite is the most common volcanic rock after basalt. It is porphyritic, that is, consists of coarse crystals (phenocrysts) embedded in a granular or glassy matrix (groundmass). Having a silica content of 57%, it is in the intermediate category (52–66% silica) of the silicic–mafic scale.
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www.enotes.com/earth-science/andesite
www.enotes.com/earth-science/andesite
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Andesite is one of the major igneous rock types. ... Andesite is an extrusive or intrusive igneous rock that is higher in silica than basalt and lower than rhyolite or felsite. (more below)
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geology.about.com/od/rocks/ig/igrockindex/rocpicandesit...
geology.about.com/od/rocks/ig/igrockindex/rocpicandesite.htm
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; Andesite is an investment manager. This web site is provided for the exclusive use of the clients and limited partners of Andesite, LLC, and requires a username and password. If you are a client and you do not have a password, please contact us to obtain one.
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www.andesitellc.com/
www.andesitellc.com/
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ANDESITE ; Andesite:; Andesite is an extrusive igneous rock, light to dark gray, sometimes with reddish to greenish hues; Andesite is between about 52 and 63 weight percent silica (SiO2). Andesite crystals are composed primarily of plagioclase feldspar and one or more of the minerals pyroxene (clinopyroxene...
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vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/andesi...
vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Notes/andesite.html
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IGNEOUS ROCK CLASSIFICATION - Where does ANDESITE fall in the Igneous Rock classification...
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www.gc.maricopa.edu/earthsci/imagearchive/andesite.htm
www.gc.maricopa.edu/earthsci/imagearchive/andesite.htm
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This andesite is so packed with plagioclase and hornblende phenocrysts that it almost looks coarse-grained. A close look (photo below) reveals a fine-grained gray groundmass surrounding the phenocrysts.
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www.pitt.edu/AFShome/c/e/cejones/public/html/GeoImages/...
www.pitt.edu/AFShome/c/e/cejones/public/html/GeoImages/2IgneousRocks/IgneousCompositions/5Andesite.html
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Andesite is an extrusive igneous rock of intermediate composition. The Andesitic magma from which these rocks originate, usually forms in subduction-zone environments. The magma is relatively viscous. The types of volcanoes that normally form from andesite are cinder cones and stratovolcanoes.
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academic.evergreen.edu/g/gutholmj/applied_geology/num5....
academic.evergreen.edu/g/gutholmj/applied_geology/num5.html
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Andesite is a fine-grained, extrusive igneous rock. It is intermediate becuase it contains some minerals that are common to rhyolite, and some common to basalt. It is always aphanitic and gray. It can look very much like basalt to the unaided eye, but it is usually less dark or greenish in color.
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www.cartage.org.lb/en/themes/Sciences/Earthscience/Geol...
www.cartage.org.lb/en/themes/Sciences/Earthscience/Geology/RocksandMinerals/MineralsandRocks/Igneous/Andesite/Andesite.htm
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