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Rhyolite is a common Igneous rock. The word "Rhyolite" is derived from the word rhýax (Greek), meaning stream of lava and the word-forming element líthos (Greek) for stone [pronounced: rahy-uh-lahyt]. The word was introduced into science by a German traveler and Geologist named Ferninand von Richthofen (in the 1800s).

Rhyolite is formed from silica-rich magma and has the same chemical composition as granite, but is extrusive rather than plutonic. Rhyolite is made up quartz, sanidine and plagioclase, with biotite and hornblende as common accessory minerals. It contains often glassy or microcrystalline aggregates.  

All igneous rocks start out as melted rock, (magma) and then crystallize, or freeze. Rhyolites that cool quickly form a natural glass or vitrophyre e.g. obsidian. Slower cooling results in foliations, spherulitic, nodular and lithophysal structures. Rhyolite eruptions can be  highly explosive and the deposits may consist of fallout tephra and ignimbrites.

Rhyolite occurs in Europe (Germany, Iceland, Spain, and Ireland), USA (Rocky Mountains and Maine), Canada, South America (Andes), China, India, New Zealand and Australia.  Rhyolite exists in all geologic ages, and is mostly confined to the continents or their immediate margins (continental crust, island arcs and dykes).

Rhyolite is commonly a dark with a glassy ground mass, however, it is considered the lightest volcanic rock. It can also be white, reddish, greenish, grey, or brownish. It may be even in colour or display a banded appearance.  The grain size is fine to very fine, however, it may sometimes be porphyric.

Due to its banding Rhyolite is commonly used in jewellery and ornaments. It is also used as an abrasive, and to make lightweight concrete and breeze blocks.

Further reading:-…………

Featured Rhyolite submitted on DA (you can of course search for more - there are plenty out there!).

Rhyolite Hills - Iceland by BakistoPyrolusite Dendrites on Rhyolite from Arizona by NisarialisPorphyritic Rhyolite by chartreuse-childRhyolite Porphyry by ElfOwl245Folded Rhyolite by MertusRainforest Jasper Wet by lionesspuma

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Welcome to all new members and watchers! A Hello! to club-affiliates. And a big Thanks to all who have submitted to the club over the last few weeks. Your contributions are appreciated!


- Blog updated.
- Folders tidied.
- Favourites updated
- Featured Updated

Feel free to drop a note if you have any queries.

All the best!
Rockhounds Admin.

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Rockhounds Club

We'd love to see your Geological submissions...

Please submit to our RockHounds Gallery!

Please Note - The club has expanded to be more inclusive. We want to encourage all the interests people have around Geology. So, we do accept all submissions related to Geology. This includes Minerals, Rocks, Fossils, Man-made & Altered specimens, Gemstones & Lapidary Work, Volcanics, Caves, Mountains, Coast, Inspired Art and other things related to Geology that haven't been mentioned!

Joining and Submitting to the Group!

To Join: Simply select the 'Join' button at the top of the page. To help the community grow it would be much appreciated (although not expected) if members and watchers could list the group in journals or signatures or advertise in some other way.

If you do not wish to join, but still wish to follow the group select the 'deviantwatch' button.

To Submit Art: All deviations must be related to Geology. Meaning they must feature natural geology and not man-made structures (e.g. walls, buildings, pathways, gravestones, statues...etc.). Please use the 'submit art' button at the top of the page to submit. There should also be a tutorial on submissions to the left-side of the screen if you're feeling stuck.

Please note: All deviations need to be approved of first before they will appear in the gallery. There is no limit (currently) on how many deviations you can submit each week.

If you have questions be sure to note the club!


Add a Comment:
Sukilucky Featured By Owner Nov 19, 2014  Hobbyist Photographer
Thank you so much for accept meHatsune Miku-10 (Appreciate)
StephLS Featured By Owner Jun 27, 2014  Hobbyist Digital Artist
Are oil rig photos acceptable? As geology profession/scenery thingamajigs.
bohemiangypsy Featured By Owner Jun 28, 2014  Hobbyist General Artist
yes, it will be fine. You can submit it under other or mines.
StephLS Featured By Owner Jun 28, 2014  Hobbyist Digital Artist
alright, thanks.
Mauijam Featured By Owner Jun 12, 2013  Hobbyist General Artist
Where is the join button its not showing...
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