Andesite pumices are megascopicallygray in mafic rocks to white in salic rocks and show a porphyritic appearancewhich is due to the presence of abundant quartz and plagioclase xenocrysts. Phenocrysticmineralsare plagioclase
Andesite pumices are megascopicallygray in mafic rocks to white in salic rocks and show a porphyritic appearancewhich is due to the presence of abundant quartz and plagioclase xenocrysts. Phenocrysticmineralsare plagioclase