Often I am asked about our source of gypsum and what makes it so special. I thought I would take this opportunity to share a piece of history with you.
SuperCal SO4 is derived from calcium sulfate dihydrate or, for you chemistry fans, CaSO4*2H20. One of the purest gypsum deposits in the world, happens to be found in a very small region of Webster County, IA, near Fort Dodge.
According to Raymond Anderson in his piece, Fort Dodge Gypsum: A Salt from Iowa’s Jurassic Sea, ”this deposit, part of the Jurassic-age Fort Dodge Formation (about 145 million years old), comprises one of the most pure gypsum deposits known on Earth.”
Anderson went on to explain, “The gypsum at Fort Dodge, like most commercial-scale deposits, had its origins in the evaporation of seawater from a restricted shallow basin. Water from the Jurassic-age Sundance Sea passed over a low-lying barrier into the basin, where the mineral salts became concentrated by evaporation in the hot semi-tropical sun. When the brine became sufficiently concentrated, gypsum crystals formed and settled to the floor of the basin.”
Check out Anderson’s article; it provides an interesting look back at one of Iowa’s most valuable natural resources and gives more insight into why our SuperCal SO4 is so pure!