Sel Gris

Sel gris is a coarse granular sea salt popularized by the French. Sel gris comes from the same solar evaporation salt pans as fleur de sel but is harvested differently; it is allowed to come into contact with the bottom of the salt pan before being raked, hence its gray color. Sel gris is coarser than fleur de sel but is also a moist salt, typically containing 13 percent residual moisture. (Wikipedia)