1. rhyolite - Noun
2. Rhyolite - Proper noun
A quartzose trachyte, an igneous rock often showing a fluidal structure.
Source: Webster's dictionaryIt typically crystallizes in granitic pegmatites or in vapor cavities in rhyolite lava flows including those at Topaz Mountain in western Utah and Chivinar in South America. Source: Internet
Geology Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcrops of rhyolite may bear a resemblance to granite. Source: Internet
The assigned densities range from 2.2g/cm3 for volcaniclastic sedimentary rocks and steam-heated altered rhyolite, to 2.6g/cm3 for undifferentiated basement Paleozoic rocks. Source: Internet
Part of the rhyolite is mineralized and appears to be related to epithermal gold mineralization throughout the property. Source: Internet
Localities and occurrence Topaz is commonly associated with silicic igneous rocks of the granite and rhyolite type. Source: Internet
Volcanic activity became concentrated in the vicinity of the present site of Long Valley Caldera 3.1 to 2.5 million years ago with eruptions of rhyodacite followed by high-silica rhyolite from 2.1 to 0.8 million years ago. Source: Internet