Nahcolite is a soft, colourless or white carbonate mineral with the composition of sodium bicarbonate also called thermokalite. It crystallizes in the monoclinic system.
Nahcolite from California (size: 9.5 x 8 x 4 cm)
Trona 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
Trona sample from Searles Valley, California near the town of Trona, California
The ambient temperature crystal structure of trona viewed down the b axis with the unit cell indicated by the solid gray line.