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A petrographic microscope is a specialized instrument used in petrography, a subdiscipline of petrology. Petrography focuses on the detailed description and classification of rocks by examining thin sections under polarized light with this microscope. This allows for the identification of mineral composition, texture, and structure, which are crucial for understanding rock formation and origin. Petrology itself is the scientific study of all three major rock types: igneous, metamorphic, and sedimentary, relying heavily on mineralogy and geological mapping.12

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