Alabaster Caverns State Park

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Alabaster Caverns State Park is a 200acre state park approximately 4.5mi south of Freedom, Oklahoma, United States near Oklahoma State Highway 50. It is home to the largest natural gypsum cave in the world that is open to the public. The gypsum is mostly in the form of alabaster. There are several types of alabaster found at the site, including pink, white, and the rare black alabaster. This black alabaster can be found in only three veins in the world, one each in Oklahoma, Italy and China. Another form of gypsum can be found in the many selenite crystal formations.HistoryThe first documented exploration of the caves occurred in 1898, shortly after Hugh Litton homesteaded the area in 1893. Public tours of the caves began in the early 1900s and increased with the 1939 purchase and renovation of the caverns by Charles Grass, who gave them their current name.The U.S. state of Oklahoma purchased the land from Grass on September 1, 1953, for $34,000, reclassifying the land as a state park in 1956.In the mid-1950s the caves served as a nuclear fallout shelter.GeologyAlabaster Caverns State Park is underlain by Permian age sedimentary rocks . The caves in the area were created around 20,000 years ago from dissolution of gypsum beds in the Permian strata. A small perennial stream now flows through the cave and is fed by various lateral tunnels and seepage from the roof. In the geologic past, the river was once capable of completely filling the 3/4 mile long caverns. The cave walls and gypsum formations show evidence of sculpting by rapidly flowing water.