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The main site is "https://www.travelok.com/state-parks/alabaster-caverns-state-park". It's a natural gypsum cave. The website begins saying: "Enter one of the largest natural gypsum caves in the world at Alabaster Caverns State Park. This rare cave is open to the public, and the only gypsum show cave in the United States. Daily guided tours of Alabaster Cavern leave promptly on the hour from 9am-4pm. For safety reasons, a maximum of 40 visitors are allowed on each tour. A fee is charged for the tour." This website http://cashandtreasures.wikifoundry.com/page/Oklahoma says: "Helpful notes to newcomers: This area of Oklahoma is known for gypsum and its various crystal habits. The nearby Glass Mountains have gypsum blade crystals."	The address on the website is: " 217036 SH 50A Freedom, OK 73842 Park Office: 580-621-3381"

The main site is "https://www.travelok.com/state-parks/alabaster-caverns-state-park". It's a natural gypsum cave. The website begins saying: "Enter one of the largest natural gypsum caves in the world at Alabaster Caverns State Park. This rare cave is open to the public, and the only gypsum show cave in the United States. Daily guided tours of Alabaster Cavern leave promptly on the hour from 9am-4pm. For safety reasons, a maximum of 40 visitors are allowed on each tour. A fee is charged for the tour."

This website http://cashandtreasures.wikifoundry.com/page/Oklahoma says: "Helpful notes to newcomers: This area of Oklahoma is known for gypsum and its various crystal habits. The nearby Glass Mountains have gypsum blade crystals."