Talk:Rhyolite

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Rhyolite is a light-colored, extrusive igneous rock with fine grains and anhedral crystals. Rhyolite is an acid rock that occurs when magma or lava cools and crystalizes underground. Rhyolite's general compostion is the same as granite's, for it is rich in quartz and alkali feldspars, along with glass, and sometimes biotite mica.

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