Kircher Society: Superman's Fortress of Solitude discovered?

Proceedings of the Athanasius Kircher Society: "In 2000, geologists at the Naica zinc mine in Mexico discovered the largest crystals ever found in a cave 300 meters beneath the Chihuahuan Desert. Some of the the sword-like selenite (gypsum) crystals are as long as 36 feet and weigh up to 55 tons. Earlier this year, Spanish geologists published a paper in the journal Geology explaining the rare set of conditions that allowed the crystals to grow so extraordinarily large. "

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