Processing and export of Hekla Pumice. Pumice is a porous, lightweight volcanic rock. Used as a substrate for green roofing. Used in green houses as an inert growing medium. Mixed with peat and soil in horticulture for increased water and air capacity. For production of high insulating lightweight concrete building blocks, chimneys, fireplaces, insulation mortars and renders. Also used as a filtering medium.
Processing and export of scoria (lightweight lava rock) for horticulture and