3. Chemical Process Industries

“Trona”, trisodium hydrogendicarbonate dihydrate (\(\ce{Na3HCO3CO3.2H2O}\), also sodium sesquicarbonate dihydrate, \(\ce{Na2CO3.NaHCO3.2H2O}\)) is a non-marine evaporite mineral. It is mined in several areas of the USA and provides nearly all the domestic consumption of sodium carbonate. Large natural deposits found in 1938, such as the one near Green River, Wyoming, have made mining more economical than industrial production in North America.