Endogenetic domes of obsidian – perlite rhyolitic lavas, limited in diameter and height, with few phenocrysts of plagioclase, hornblende, biotite, magmatic eroded quartz and magnetite.
Endogenetic domes of obsidian – perlite rhyolitic lavas, limited in diameter and height, with few phenocrysts of plagioclase, hornblende, biotite, magmatic eroded quartz and magnetite.