Talk:Andesite

This  level-5 vital article is rated B-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

Volcanoes Top‑importance This article is within the scope of WikiProject Volcanoes, a collaborative effort to improve the coverage of volcanoes, volcanology, igneous petrology, and related subjects on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.VolcanoesWikipedia:WikiProject VolcanoesTemplate:WikiProject VolcanoesWikiProject Volcanoes articles Top This article has been rated as Top-importance on the project's importance scale. Geology High‑importance Talk:Andesite is part of WikiProject Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information.GeologyWikipedia:WikiProject GeologyTemplate:WikiProject GeologyGeology articles High This article has been rated as High-importance on the project's importance scale. Rocks and minerals Mid‑importance Andesite is part of WikiProject Rocks and minerals, an attempt at creating a standardized, informative, comprehensive and easy-to-use rocks and minerals resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information.Rocks and mineralsWikipedia:WikiProject Rocks and mineralsTemplate:WikiProject Rocks and mineralsRocks and minerals articles Mid This article has been rated as Mid-importance on the project's importance scale.

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 and oligoclase), pyroxene, amphibole and biotite mica.

OK. Whoever that was, wrong, wrong, wrong. How can it be an extrusive rock which cools underground? Really. Rolinator 05:14, 27 December 2005 (UTC)[reply]

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. 38.100.75.194 (talk) 15:11, 12 March 2010 (UTC)[reply]

@38.100.75.194 is it a hard rock or soft? why doesn't article say? it's used in ancient temples in Indonesia. Carvings 2600:1010:B115:F884:0:4D:9DF8:2501 (talk) 07:21, 9 March 2023 (UTC)[reply]

Don't know much about geology, but I have a feeling that this article has suffered from some juvenile sabotage:

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:

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.

Panatomic (talk) 17:11, 30 December 2007 (UTC)[reply]

Fixed, thanks - Vsmith (talk) 20:52, 30 December 2007 (UTC)[reply]

I'm pretty sure that the thin section in the article is in cross nicols and not in plane polarized light. 38.100.75.194 (talk) 15:14, 12 March 2010 (UTC)[reply]

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. --Furrfu (talk) 20:01, 21 March 2010 (UTC)[reply]

There appears to be a few words missing towards the end of the section, "Generation of melts in island arcs":

"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."

Where it says "to the they", was this originally intended to read, "to the theory that they"? Invertzoo (talk) 12:34, 18 May 2014 (UTC)[reply]

I've reverted the edit by an IP that made nonsense out of that sentence - thanks for pointing that out. Mikenorton (talk) 22:39, 18 May 2014 (UTC)[reply]

Hello fellow Wikipedians,

I have just modified 2 external links on Andesite. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20071104205758/http://nsw.royalsoc.org.au:80/journal_archive/132_34.html to http://nsw.royalsoc.org.au/journal_archive/132_34.html
• Added archive https://web.archive.org/web/20071208203514/http://geology.csupomona.edu:80/alert/igneous/texture.htm to http://geology.csupomona.edu/alert/igneous/texture.htm

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 19:38, 12 October 2016 (UTC)[reply]