Quartzite, a metamorphic rock formed when quartz-rich sandstone or chert has been exposed to high temperatures and pressures. Brazil

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: archival, archive, brazil, chert, heat, historical, history, metamorphic, natural, nature, pressure, quartz, quartz-rich, quartzite, rock, sandstone, temperature