Question
Discuss the megascopic and microscopic characters of rhyolite with the help of neat well labelled diagrams.
Answer :
Word Count : 416
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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. Its texture is generally aphanitic, meaning individual mineral grains are not visible to the naked eye. Rhyolite may also exhibit porphyritic texture, characterized by larger, well-formed phenocrysts embedded in a fine-grained groundmass. Phenocrysts in rhyolite typically include quartz,
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