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Muscovite is a common rock-forming mica belonging to the monoclinic crystal system and exhibits well-defined optical properties that are important in mineral identification under the polarizing microscope. It is optically anisotropic and shows double refraction. Muscovite is a biaxial mineral with negative optic sign. Its refractive indices are relatively low to moderate, with α and β being close in value and γ __________ ___ __________ __________ _____ __________ ___ ________ ___ ______ _____.
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