Petrographic microscope

A petrographic microscope is a type of optical microscope used in petrology and optical mineralogy to identify rocks and minerals in thin sections. The microscope is used in optical mineralogy and petrography, a branch of petrology which focuses on detailed descriptions of rocks. The method is called "polarized light microscopy" (PLM).

Plain light with the first filter (above), crossed-polarized light with both filters (below) in a volcanic lithic fragment (sand grain). Scale box in millimeters.
Leica DMRX incident light microscope with mechanical stage and Swift F automated point counter for analysis of organic composition of coal and rock samples
Thin sections under a microscope.
Photomicrograph of a thin section of gabbro in cross-polarized light

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