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Olivine (forsterite) phenocrysts, with minor pyroxene in a ground mass of plagioclase feldspar. Kilauea volcano, Hawaii. FOV is about 3 mm. (Author: Jesse Fisher)

Olivine (forsterite) phenocrysts, with minor pyroxene in a ground mass of plagioclase feldspar. Kilauea volcano, Hawaii. FOV is about 3 mm. (Author: Jesse Fisher)

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