No, readers, that it not the title of a story – though it ought to be! The geode of Pulpi is a thirty-six foot rock formation discovered by geologists in a cavern. It is real and quite beautiful.
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The Mystery of the Giant Crystals: How the 36-foot Geode of Pulpí Formed
caves, places to visit, Researches 7:00 PM
This incredible natural space is the Geode of Pulpí, the closest thing in real life to Superman’s Fortress of Solitude: an amazing egg-shaped cavern where jagged shards of brilliant, clear crystal jut from the walls like teeth in a dragon’s mouth.
The geode of Pulpí is an 11-meter hollow ovoid with crystal-paneled walls. It is like those familiar couplets of stone interiors covered with bright crystallites, but so large that several people can fit inside. The crystals, of up to two meters in size, are so transparent that they look like ice crystals. In this paper for Geology, Juan Manuel García-Ruiz and colleagues reveal the geological history that ended with the formation of the Pulpí geode.
As far as geodes go, Pulpí’s is a giant – one of the largest known geodes in the world in fact.
In terms of cavernous chambers, though, it’s actually tiny, but is large enough that multiple people can fit inside it at once, which isn’t something you can say about most geode cavities.
Like the giant crystals of Naica in Mexico, the crystals of Pulpí are gypsum (calcium sulfate with two water molecules). García-Ruiz says, “To reveal their formation has been a very tough task because unlike in the case of Naica, where the hydrothermal system is still active, the large geode of Pulpí is a fossilized environment.”