Rhyolite is an extrusive igneous rock with a very high silica content. It is usually pink or gray in color with grains so small that they are difficult to observe without a hand lens. Rhyolite is made up of quartz, plagioclase, and sanidine, with minor amounts of hornblende and biotite.Click to see full answer. Similarly, you may ask, what is rhyolite used for? Rhyolite Uses In the modern era, the rock is sometimes used in construction. Gems commonly occur in rhyolite. The minerals form when lava cools so quickly that gas becomes trapped, forming pockets called vugs. Water and gases make their way into the vugs.Secondly, what is the texture of Rhyolite? Rhyolite is extrusive equivalent of granite magma. It is composed predominantly of quartz, K–feldspar and biotite. It may have any texture from glassy, aphanitic, porphyritic, and by the orientation of small crystals reflecting the lava flow. Moreover, where can I find Rhyolite? Rhyolite is found in volcanic arcs where crustal rocks have been subducted under continental crust and melted into a lighter magma rich in silica.How is rhyolite created?Rhyolite is a volcanic rock. It is fine-grained because it forms by the rapid cooling of magma, usually when it erupts onto the Earth’s surface. When rhyolite erupts quietly it forms lava flows. If it erupts explosively it often forms pumice.

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