 The Company is also the world’s leading producer of high purity quartz, a highly specialized product used in the fabrication of integrated circuits, solar photovoltaic cells and high intensity lighting.Unimin’s product portfolio includes industrial sand, high purity quartz, feldspar, nepheline syenite, microcrystalline silica, ball clay, kaolin, calcium carbonate and calcium quicklime and hydrate.Quicklime and hydrated lime products are produced and sold by their Southern Lime subsidiary.