Product Description

Rock Type:  Lamprophyre Dike

Location:  Wawa, Ontario

Description:  The rock is an undeformed porphyritic lamprophyre dike.  The principal mineral assemblage is pseudohexagonal and lath shaped biotite-phlogopite solid solution micas (brown-red).  These grains are within a groundmass dominated by calcite and plagioclase laths.  Magnetite grains (black) have formed on the margins of the biotite-phlogopite grains.  The rock was studied for its diamond potential.