Talk:Rhyolite

Latest comment: 1 year ago by MrDemeanour in topic Quartz

Info

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Rhyolite is a light-colored, extrusive igneous rock with fine grains and anhedral crystals. Rhyolite is an acid rock that occurs when magma or lava cools and crystalizes underground. Rhyolite's general compostion is the same as granite's, for it is rich in quartz and alkali feldspars, along with glass, and sometimes biotite mica. — Preceding unsigned comment added by 70.186.211.176 (talk) 01:00, 5 August 2005 (UTC)Reply

Second sentence: "Rhyolite is an acid rock that occurs when magma or lava cools and crystalizes underground" - is technically correct but confusing. Granite is an acid rock that occurs when magma crystalizes underground - the eruptive equivalent (which may or may not be associated with outcropping granite) is ryholite. Yendor of yinn (talk) 03:38, 15 August 2011 (UTC)Reply

Idaho

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Rhyolite certainly isn't hard to find in Idaho. Almost anywhere there's granite colse to a river, there's rhyolite. 16 July 2009, Ken Davis, Caldwell, Idaho —Preceding unsigned comment added by 67.60.70.102 (talk) 00:07, 17 July 2009 (UTC)Reply

Testing spelling mistakes

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I was trying to find this page by misspelling rhyolite as "rialite" or "ryelite" and the search engine couldn't get me here. I linked here from the obsidian page, but it could have been easier. Eddietoran (talk) 05:25, 2 September 2009 (UTC)Reply

  Donehike395 (talk) 17:10, 20 January 2019 (UTC)Reply

Practical uses

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The article mentions quarrying of Rhyolite since prehistory, but does not explain the uses of the rock once extracted.--Theodore Kloba (talk) 15:44, 28 September 2012 (UTC)Reply

  Donehike395 (talk) 17:10, 20 January 2019 (UTC)Reply

Occurrence section

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The occurrence section should in my view discuss the types of volcanic provinces in which rhyolites are found, not be a very partial list of places where rhyolite can be found - it is not a rare rock. Mikenorton (talk) 11:58, 15 September 2016 (UTC)Reply

Entirely agree, the list could ultimately be very long indeed! Geopersona (talk) 09:35, 20 January 2019 (UTC)Reply
Couldn't really find a good RS -- would you like to take a crack at it, Geopersona? —hike395 (talk) 17:10, 20 January 2019 (UTC)Reply
Will take a crack at this from the sources I have on hand. --Kent G. Budge (talk) 23:16, 20 September 2021 (UTC)Reply
Done. Though I may try to find more to add on intraplate silicic volcanism. --Kent G. Budge (talk) 00:56, 22 September 2021 (UTC)Reply

Rhyolite in Europe

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Rhyolite also appears in the Tokaj region of Hungary. — Preceding unsigned comment added by 199.247.36.47 (talk) 07:22, 30 July 2019 (UTC)Reply

Quartz

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It says:

"An extrusive igneous rock is classified as rhyolite when quartz constitutes 20% to 60% by volume of its total content of quartz, alkali feldspar, and plagioclase (QAPF) and alkali feldspar makes up 35% to 90% of its total feldspar content."

Presumably quartz actually constitutes 100% of its total volume of quartz. I'm not sure whether this is a punctuation problem, or a problem with reading the sources. I didn't try to check the sources, which look rather academic - and I'm not qualified to make sense of academic mineralogical writing.

MrDemeanour (talk) 15:44, 30 January 2023 (UTC)Reply