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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
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
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
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
"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.