Search results
Results from the WOW.Com Content Network
The name rhyolite was introduced into geology in 1860 by the German traveler and geologist Ferdinand von Richthofen [27] [28] [29] from the Greek word rhýax ("a stream of lava") [30] and the rock name suffix "-lite".
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 name of the program, originally "Rhyolite", was changed to "Aquacade" in 1975 following the disclosure of the codeword "Rhyolite" in the trial of Christopher Boyce and Andrew Lee. The Rhyolite/Aquacade satellites, made by TRW , are rumored to have an umbrella-like reflecting dish 20 meters in diameter.
Volcanic clastic rock cobbles of rhyolite, in a sandstone matrix in this area are named Poway clasts. [2]The ancient Ballena River brought rhyolite-gravel, or "Poway" clasts, from a region in present-day Sonora, Mexico to the Pacific Ocean.
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 ...
Accessory minerals like pyroxenes provide insight to the history of the magma. The formation of dacite provides a great deal of information about the connection between oceanic crust and continental crust. It provides a model for the generation of felsic, buoyant, perennial rock from a mafic, dense, short-lived one.
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.
The unit was originally designated as the Vallecitos rhyolite by Evan Just in his study of pegmatites in the Tusas Mountains. [7] but this name was already in use, and it was renamed the Burned Mountain metarhyolite by F. Barker in 1958. [4]