synthetic fluorspar produced in the United States. In 2018, three companies—J.R. Simplot Co. (Boise, ID), Mosaic Fertilizer LLC (Tampa, FL; a subsidiary of The Mosaic Co.), and Nutrien Ltd. (Saskatoon, Saskatchewan, Canada)— produced marketable FSA, a byproduct from the processing of phosphate rock into phosphoric acid, at five plants inWeb