Quartzite is a metamorphic rock mostly made of quartz. Photomicrograph, thin section, polarized light.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: cuarcita, geology, light, metamorphic, microscope, petrographic, petrology, photomicrograph, polarized, polarizing, quartz, quartzite, rock, sandstone, section, thin