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Amethyst is a variety of quartz, which is a mineral that is formed in igneous and metamorphic rocks. Amethyst is typically formed in hydrothermal veins within igneous rocks or as a product of metamorphism in rocks rich in silica. Therefore, amethyst is not classified as a specific rock type, but rather a mineral that can be found in both igneous and metamorphic rocks.

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ProfBot

4mo ago

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