The U.S. strontium industry experienced a major shakeup during 1983 when the leading domestic producer of strontium chemicals announced plans to close its plants. Changes also occurred in the world marketplace as Japan surpassed the United States as the leading consumer of strontium compounds. Neither the United States or Japan mine celestite, the commercial strontium mineral form. Mexico supplies most of the U.S. celestite demand, while Spain satisfies most of the Japanese demand. Primary strontium compounds were used primarily in glass manufacture for television picture tubes, and to a lesser extent in pyrotechnics and signals, ferrite permanent magnets, pigments and fillers, and electrolytic production of zinc.