The giant geode of Pulpí

phys.org | 8/8/2014 | Staff
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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.

Like the giant crystals of Naica in Mexico (see the 2007 Geology article by García-Ruiz and colleagues at pubs.geoscienceworld.org/gsa/g … cle/35/4/327/129804/), 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."

Team - Study - Geology - Geochemistry - Mine

The team performed a study of the geology and geochemistry of the abandoned mine where the geode was found, including a detailed mapping of the underground mining works, which has been used to allow the tourist visits in the...
(Excerpt) Read more at: phys.org
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