» This page's 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's an evaporite mineral. It's mined as the primary source of sodium carbonate in the United States, where it's replaced the Solvay process used in most of the rest of the world for sodium carbonate production. Natural occurrence Trona's found at Owens Lake and Searles Lake, California; the Gree… (More on Trona)