Gypsum is a calcium sulfate mineral. Photomicrograph, thin section, polarized light.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
License: Royalty Free
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Keywords: calcium, evaporite, geology, gypsum, light, microscope, mineral, mineralogy, petrographic, photomicrograph, polarized, polarizing, section, sulfate, thin