Superman's Fortress of Solitude! In actuality, this is a gypsum (aka "selenite") crystal from the Naica Mine in Chihuahua, Mexico. The "Cavern of Crystal Giants" featured in National Geographic (ngm.nationalgeographic.com/2008/11/crystal-giants/shea-text) hosted half-a-million year old crystals up to 100 feet in length! The crystals at Nature's Treasures were found 100s of feet below the surface of the mine in a maze of interconnected caverns. Based on the size of these crystals (a solid 2-4 feet in length), I guess you could think of them as baby "Hagrid" crystals (referring to the famous half-giant, half-human wizard from Harry Potter) Look through our gallery below!