Dacite is an igneous extrusive rock intermediate between andesite and rhyolite. Photomicrograph, thin section, polarized light.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: dacita, dacite, extrusive, geology, igneous, light, microscope, petrographic, petrology, phenocryst, photomicrograph, polarized, polarizing, porphyritic, rock, section, texture, thin, volcanic