BELFAST EXTRA GRANITEBelfast Extra Granite is a Precambrian era fine grained black gabbro norite. A transparent epoxy resin filler may be used during the polishing process to cover any micro fissures or microscopic pitting, however, this has no effect on the stone's integrity and only produces a uniformly smoother surface finish. Belfast Extra Granite is frost resistant and has a consistent finish, making it appropriate for both indoor and exterior use. Prefabricated