Andesite

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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andesite

Igneous volcanic rock, less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_2.html

andesite

[n] - a dark gray volcanic rock
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Andesite

An'desĀ·ite noun (Min.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene.
Found on http://www.encyclo.co.uk/webster/A/80

andesite

<chemical> An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene. ... Source: Websters Dictionary ... (01 Mar 1998) ...
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andesite

noun a dark grey volcanic rock
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Andesite

• (n.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene.
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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]
Found on http://www.britannica.com/eb/a-z/a/71

Andesite

fine-grained igneous rock of intermediate composition. Up to half of the rock is plagioclase feldspar with the rest being ferromagnesian minerals.
Found on http://en.wikipedia.org/wiki/Glossary_of_geology

Andesite

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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andesite

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 (SiO2). Andesites contain crystals composed primarily of plagioclase feldspar...
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andesite

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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Andesite

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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Andesite

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.
Found on http://www.geonet.org.nz/volcano/glossary.html

Andesite

Volcanic rock (or lava) characteristically medium dark in color and containing 54 to 62 percent silica and moderate amounts of iron and magnesium.
Found on http://www.encyclo.co.uk/local/21455

Andesite

a variety of volcanic rock.
Found on http://www.copperfoxmetals.com/s/GlossaryOfTerms.asp

Andesite

Major minerals: plagioclase (often andesine) and pyroxene and/or hornblende Andesite t is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. In a general sense, it is the intermediate type between basalt and dacite, and ranges from 57 to 63% silicon dioxide (SiO2) as illustrated in TAS diagrams...
Found on http://en.wikipedia.org/wiki/Andesite

andesite

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
Found on http://www.encyclo.co.uk/local/22291

andesite

A fine-grained volcanic rock of intermediate composition, consisting largely of plagioclase and one or more mafic minerals.
Found on http://www.ge-at.iastate.edu/glossary-of-geologic-terms/

andesite

Igneous volcanic rock (~60% SiO2), less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite.
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Andesite

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...
Found on http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html

Andesite

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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Andesite

A fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as ho
Found on http://www.encyclo.co.uk/local/22392

Andesite

Volcanic rock (or lava) characteristically medium dark in color and containing 54 to 62 percent silica and moderate amounts of iron and magnesium.
Found on http://volcano.oregonstate.edu/glossary/1
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