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Rhyolite is a fine-grained, extrusive igneous rock that is the volcanic equivalent of granite. It is typically felsic in composition, containing high amounts of silica, along with minerals such as quartz, feldspar, and minor biotite or amphibole. The study of rhyolite involves both megascopic (hand specimen) and microscopic (thin section) characteristics, which together provide a comprehensive understanding of its texture, mineralogy, and formation. Megascopically, rhyolite often appears light-colored, ranging from pale grey, pink, or reddish hues due to the presence of alkali feldspar. ________ _____ __________ _______ _________ ___.
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