Gunther Salt Company - St.Louis based producer of salt for a variety of industrial uses. Includes details of salt mining and production. Sekyung Corporation - Supplier of North Korean magnesia clinker 9010. Sibelco - Producer of silica sand and flours, cristobalite, nepheline syenite, and ball clay. Magnesia International.com - Consortium of suppliers of magnesium oxide and magnesium hydroxide products. Rapra International - Indian manufacturer and distributor of mineral powders, including calcite, ground calcium carbonate, talc, mica, diamaceous earth, kaolin and quartz. Gilsonite and Specialty Asphalt Producer - Producer of gilsonite, North American Asphaltum, uintaite, and specialty asphalt products. Zoutman Industries - Salt producer. Koch Carbon, KOMSA, C. Reiss Coal - Dealers in petroleum coke, coal, slag, cement, clinker, and related products. Swala Gem Traders - Distributor of gemstones directly from the mines, including tanzanites, tsavorites, rhodolites, tourmalines from East Africa.