Wild About Utah: Mirabilite Mounds At The Great Salt Lake
Credit Mary Heers Back in October 2019, the ranger at the Great Salt Lake State Park began to notice a white mound forming on the sand flats behind the visitor center. The white mounds turned out to be hydrated sodium sulfate, known as mirabilite, which was being carried to the surface by the upwelling of a fresh water spring. Since the 1940's geologists have known that in this area, 30 inches below the surface, there was a three to six-foot thick shelf of mirabilite. They knew about the freshwater springs. What was new was cold air. Since this stretch of sand was no longer underwater, the ...