Cesium is not mined in the United States. Pollucite, the principal ore mineral of cesium, is imported as focus from Canada by one company in the United States. There are occurrences of pollucite in pegmatites in South Dakota and Maine. Because of its high density, the main utilize of cesium is in the manufacture of specialty, high-density drilling fluids used in the global oil and gas exploration industry.

World Resources



  1. Caesium is used as a catalyst in the hydrogenation of limited organic compounds.
  2. Radioactive isotopes of caesium are used in the medical field to treat certain types of cancer.
  3. Caesium fluoride is extensively used in organic chemistry as a base and as a source of anhydrous fluoride ion.