Abstract
Large plagioclase and basic andesite containing it were chemically analyzed. Plagioclase proved to be anorthite of An93.4 composition. Its mother rock is not comparatively high in Al2O3 composition and it contains labradrite phenocrysts together with anorthite large crystals.
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More From: The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
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