Search results
Results from the WOW.Com Content Network
Rhyolite. Rhyolite (/ ˈraɪ.əlaɪt / RY-ə-lyte) [1][2][3][4] is the most silica -rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly quartz, sanidine, and ...
Rhyolite is a ghost town in Nye County, in the U.S. state of Nevada. It is in the Bullfrog Hills, about 120 miles (190 km) northwest of Las Vegas, near the eastern boundary of Death Valley National Park. The town began in early 1905 as one of several mining camps that sprang up after a prospecting discovery in the surrounding hills.
Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals. Llanite comes from a hypabyssal porphyritic rhyolite dike that intrudes Precambrian ...
The mechanical properties of the rhyolite on Mount Kineo exhibits the physical properties of flint and was used extensively by indigenous peoples to make arrowheads and implements and thus, has often been referred to as "Kineo flint" in literature; but this term misleads by implication that the rhyolite is a cryptocrystalline form of the ...
86000817 [1] Added to NRHP. January 15, 1986. The Carbaugh Run Rhyolite Quarry Site is an archaeological site in Franklin Township, Adams County, Pennsylvania, United States. It is composed of two smaller sites: a group of small quarries on top of Snaggy Ridge, and the remnants of what may have been a campsite along Carbaugh Run below the ridge.
Rhyolite is a volcanic rock with high silica content. Rhyolite has silica content similar to that of granite while basalt is compositionally equal to gabbro. Intermediate volcanic rocks include andesite, dacite, trachyte, and latite. [citation needed] Pyroclastic rocks are the product of explosive volcanism. They are often felsic (high in silica).
Porphyry (geology) "Imperial Porphyry" from the Red Sea Mountains of Egypt. A waterworn cobble of porphyry. Rhyolite porphyry from Colorado; scale bar in lower left is 1 cm (0.39 in) Porphyry (/ ˈpɔːrfəri / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine ...
The Bearhead Rhyolite is a thick stack of rhyolite tuffs, flows, domes, and associated shallow intrusions exposed from the northeastern Valles caldera rim to north of Cochiti Pueblo. It is named for exposures on Bearhead Peak ( 35°43′30″N 106°28′59″W / 35.725°N 106.483°W / 35.725; -106.483 ), one of the major source ...