Gypsum, a natural mineral made largely of calcium sulfate ... And, apparently, for the Romans covering their dead in the liquid form—which included mixing the gypsum in water.

The presence of dolomite, clay minerals, and pyrite signals the ... For dolomite to form within gypsum without the presence ...

They may look like mounds of snow, but the dunes in this park are made of a rare form of crystallized gypsum ... the land forms a basin, trapping the mineral; water evaporates, leaving the gypsum ...