Trona
（重定向自Urao）
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![Trona sample from Searles Valley, California near the town of Trona, California](/Images/godic/202502/19/Trona_from_Trona2629.jpg")
![The ambient temperature crystal structure of trona viewed down the b axis with the unit cell indicated by the solid gray line.](/Images/godic/202502/19/Trona_crystal_structure2629.jpg")
Trona (trisodium hydrogendicarbonate dihydrate also sodium sesquicarbonate dihydrate, Na3(CO3)(HCO3)•2H2O) is a non-marine 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.