The geode contains crystals over six foot tall, which are so clear they look like ice.
The geological history that led to the formation of giant crystals and a 36-foot geode has been revealed by scientists. By looking at the abandoned mine where the geode of Pulpí was found, they were able to show the conditions it formed in hundreds of thousands of years ago.
The geode of Pulpí was discovered in 1999 in the Mina Rica silver mine in southeast Spain. The walls of the cave are covered with huge crystals that are so transparent they look like blocks of ice. It is thought that the geode of Pulpi is one of the largest in the world, with the interior measuring about 390 cubic feet.
Huge crystal caves have been discovered across the globe in recent decades, including the El Teniente mine in Chile and, most famously, the Cave of Crystals in Naica, Mexico. Explaining how these geological features formed, however, is difficult—they grow very slowly and, in most cases, the systems in which they developed are no longer active.
"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," Juan Manuel García-Ruiz, from Spain's Higher Council for Scientific Research ,"García-Ruiz and colleagues were hoping to find out how the geode of Pulpí grew by creating geological maps of the area and performing mineralogical and geochemical analysis to work out the...
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