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Info
editRhyolite 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)
- 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)
Idaho
editRhyolite 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)
Testing spelling mistakes
editI 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)
Done —hike395 (talk) 17:10, 20 January 2019 (UTC)
Practical uses
editThe 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)
- Done —hike395 (talk) 17:10, 20 January 2019 (UTC)
Occurrence section
editThe 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)
- Entirely agree, the list could ultimately be very long indeed! Geopersona (talk) 09:35, 20 January 2019 (UTC)
- 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)
- Will take a crack at this from the sources I have on hand. --Kent G. Budge (talk) 23:16, 20 September 2021 (UTC)
- Done. Though I may try to find more to add on intraplate silicic volcanism. --Kent G. Budge (talk) 00:56, 22 September 2021 (UTC)
Rhyolite in Europe
editRhyolite also appears in the Tokaj region of Hungary. — Preceding unsigned comment added by 199.247.36.47 (talk) 07:22, 30 July 2019 (UTC)
Quartz
editIt 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.