» This page is about the mineral. For the town, please see Trona, California; for the geological feature, please see Trona Pinnacles. Trona, hydrated sodium bicarbonate carbonate (Na3HCO3CO3·2H2O), 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. Trona is found at Owens Lake and Searles Lake, California; Green River Formation,… (More on Trona)