» This page is about the mineral. For the town, please see Trona, California; for the geological feature, please see Trona Pinnacles. Trona (trisodium hydrogendicarbonate dihydrate); Na3H(CO3)2·2H2O is an evaporite mineral. It is mined as the primary source of sodium carbonate in the United States, where it has replaced the Solvay process used in most of the rest of the world for sodium carbonate production. Natural occurrence Trona is found at Owens Lake and Searles Lake, California; th… (More on Trona)