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Andesite is a fine-grained, extrusive igneous rock with anhedral or euhedral crystals. It's an intermediate rock and it has a medium color. It occurs when lava or magma from an andesite volcano cools underground. It usually has 55 to 65% total silica content, along with plagioclase feldspar(andesine
544:"Although there is evidence to suggest that the subducting oceanic crust may also melt during this process, the relative contribution of the three components (crust, sediment, and wedge) to the they also happen to self combust and they are electric generated basalts is still a matter of debate."
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Ultimately, the resultant composition of andesite and intermediate magmas is the result of fractional crystallisation, assimilation, partial melting cbnvcnvcnnbvcnbvc and contaminaton by the subducted slab.
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Yes, "polarised light" means nothing -- it should say whether it's plane-polarised light or between crossed polars. The image itself has metadata specifying the latter, so I've changed it. --
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The water and initial tylerisstupid slab melts rise into the mantle wedge... The following part looks odd, too, unless it is some technical code unfamiliar to me:
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It is an extrusive rock. It cools near the surface or at the surface (or somewhere where heat can escape relatively fast). This is why it is fine grained.
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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Don't know much about geology, but I have a feeling that this article has suffered from some juvenile sabotage:
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There appears to be a few words missing towards the end of the section, "Generation of melts in island arcs":
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OK. Whoever that was, wrong, wrong, wrong. How can it be an extrusive rock which cools underground? Really.
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I'm pretty sure that the thin section in the article is in cross nicols and not in plane polarized light.
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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I've reverted the edit by an IP that made nonsense out of that sentence - thanks for pointing that out.
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is it a hard rock or soft? why doesn't article say? it's used in ancient temples in
Indonesia. Carvings
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https://web.archive.org/web/20071208203514/http://geology.csupomona.edu:80/alert/igneous/texture.htm
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https://web.archive.org/web/20071104205758/http://nsw.royalsoc.org.au:80/journal_archive/132_34.html
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before doing mass systematic removals. This message is updated dynamically through the template
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Where it says "to the they", was this originally intended to read, "to the theory that they"?
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and oligoclase), pyroxene, amphibole and biotite mica.
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