Its lavas are dotted with phenocrysts , which vary from 2 to 25 percent of their mass .
It is mainly basaltic andesite and rhyodacite that make up Calabozos , forming a calcalkilic suite rich with potassium .
Calabozos ' lavas are dotted with phenocrysts , which vary from 2 to 25 percent of their mass .
It is mainly basaltic andesite and rhyodacite that make up Calabozos , forming a calcalkilic suite rich with potassium .