Many of the pieces he excavated are of a rock called rhyolite. From Wordnik.com. [Outer Sanctum: Why we love to step outside the box to think inside the shed] Reference
It is mostly underlain by volcanic ash, rhyolite, and tuffaceous rocks. From Wordnik.com. [Ecoregions of Nevada (EPA)] Reference
Rocks formed from felsic magma include granite, granodiorite, dacite, and rhyolite. From Wordnik.com. [Igneous rock] Reference
This software calculates H2O-CO2-melt equilibrium for the rhyolite and basalt systems. From Wordnik.com. [Jacob B. Lowenstern] Reference
A-type granophyre and rhyolite from the Alid volcanic center, Eritrea, northeast Africa. From Wordnik.com. [references] Reference
The blocks are chemically, isotopically, and mineralogically similar to the host rhyolite. From Wordnik.com. [Granophyre.html] Reference
Around the Caldera is ash, rhyolite, volcanic glass and other structures attributed to the eruptions. From Wordnik.com. [worlds in a grain of sand] Reference
Dacite and granodiorite contain slightly more biotite and amphibole minerals than granite and rhyolite. From Wordnik.com. [Igneous rock] Reference
Geologically, the Plateau is composed of Quaternary extrusive rocks, mostly rhyolite, basalt, and tuff. From Wordnik.com. [Ecoregions of Wyoming (EPA)] Reference
On the southern rim of the Mount Warning crater, rhyolite cliffs have been undercut forming rockshelters. From Wordnik.com. [Central Eastern Rainforest Reserves, Australia] Reference
Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite). From Wordnik.com. [volcanic ash hazards and ways to minimize them] Reference
Dacite and rhyolite magmas with low concentrations of dissolved gases can erupt as lava flows, producing little or no ash. From Wordnik.com. [volcanic ash hazards and ways to minimize them] Reference
Additionally, volcanoes are grouped by type, from the stratovolcanoes to rhyolite caldera complexes and monogenetic fields. From Wordnik.com. [Volcanoes in Mexico] Reference
The mountain ranges are a geologic mix of faulted limestone reefs, volcanoes and associated basalt, rhyolite, and tuff extrusive rocks. From Wordnik.com. [Ecoregions of Texas (EPA)] Reference
Obsidian is actually a naturally occurring translucent glass formed as rapidly cooled rhyolite lava is extruded from an active volcano. From Wordnik.com. [The Last of the Obsidian Artifacts in Puerto Vallarta] Reference
The West Yellowstone Plateau ecoregion contains rhyolite and basalt flows, lakes, springs, outwash plains, moraines, canyons, and wetlands. From Wordnik.com. [Ecoregions of Idaho (EPA)] Reference
Yellowstone rhyolite plateau: U.S. Geological Survey. From Wordnik.com. [Scientific Articles on Yellowstone] Reference
Maul from broken rubbing stone or grinder, grooved at each end; rhyolite. From Wordnik.com. [Illustrated Catalogue Of The Collections Obtained From The Indians Of New Mexico And Arizona In 1879 Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pages 307-428] Reference
These deposits occur at or near the top of the eastern Daly Lake rhyolite. From Wordnik.com. [Marketwire - Breaking News Releases]
Trachyte — A variety of felsite superficially closely resembling rhyolite. From Wordnik.com. [Tseh So, a Small House Ruin, Chaco Canyon, New Mexico :] Reference
Granite is an acidic rock corresponding to rhyolite in chemical composition. From Wordnik.com. [The Elements of Geology] Reference
1972, Volcanic stratigraphy of the Quaternary rhyolite plateau in Yellowstone National. From Wordnik.com. [Scientific Articles on Yellowstone] Reference
It then cools quickly and forms finely crystalline rocks of the rhyolite and basalt types. From Wordnik.com. [The Economic Aspect of Geology] Reference
There are lots of small sharp edges and pockets like the rhyolite in my home area, Queen Creek. From Wordnik.com. Reference
The last Tarawera eruption was also basaltic if I remember rightly, in a rhyolite caldera setting. From Wordnik.com. [ScienceBlogs Channel : Life Science] Reference
At the Raindrop Zone, the eastern Daly Lake rhyolite is overlain by the western Daly Lake rhyolite. From Wordnik.com. [Marketwire - Breaking News Releases]
What-you expect me to come up with a team at a moments notice what with this volcano spewing rhyolite?. From Wordnik.com. [Podium Cafe] Reference
Company geologists have recognized the potential extension of the Discovery Zone rhyolite in this area. From Wordnik.com. [The Earth Times Online Newspaper] Reference
The rock at Pinnacles is mostly igneous rhyolite and tuff, not the granite and basalt of many volcanic areas. From Wordnik.com. [Denver Post: News: Breaking: Local] Reference
Fifty yards away and in full sight of the cabin, the mouth of a tunnel yawned blackly under a rhyolite ledge. From Wordnik.com. [The Trail of the White Mule] Reference
These wall rocks are locally sheared, sericite altered and mineralized with pyrite, rhyolite and chalcopyrite. From Wordnik.com. [Marketwire - Breaking News Releases]
Jabal Abyad, in the center of the image, was formed from a more viscous, silica-rich lava classified as a rhyolite. From Wordnik.com. [doggdot.us] Reference
The gold mineralization is hosted by a much larger zone of pyrite stockwork in a highly silicified and sericitized rhyolite. From Wordnik.com. [Marketwire - Breaking News Releases]
Grand Canyon with thousands of feet of rhyolite and other products of volcanism beneath it is alone sufficient proof of that. From Wordnik.com. [The Book of the National Parks] Reference
This zone is composed of a sedimentary sequence (limestone, quartzite, shale) intruded by dacite and diorite as well as rhyolite. From Wordnik.com. [The Earth Times Online Newspaper] Reference
1985, Behavior of nuclear waste elements during hydrothermal alteration of glassy rhyolite in an active geothermal system; Yellowstone. From Wordnik.com. [Scientific Articles on Yellowstone] Reference
Each of the buttes 'peaks was a vent that spewed out those rocks of androsite and rhyolite more than a million years ago, Reusser said. From Wordnik.com. [www.appeal-democrat.com - News :] Reference
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