Profile: Unimin Corp. produces natural minerals. We offer uniform silica sands, nepheline syenite, feldspars, olivine, microcrystalline silicas, ball clays & kaolins, dolomite, talc, calcium carbonate, magnetite, barite, bentonite clays and high purity quartz. Our products serve as the essential raw materials in nearly every manufacturing process. We serve the glass, fiberglass, ceramic, semiconductor, quartz lighting, oil and gas industries.