Product Description

Rock Type:  Volcanic breccia

Location:  Columbia

Description:  Breccia fragments consist of coarse plagioclase phenocrysts, now replaced by muscovite and an abundance of Ba-K-feldspar within a finer-grained groundmass comprised by smaller plagioclase microphenocrysts variably replaced by muscovite and Ba-K-feldspar.  The rock was studied for its gold-silver potential.