TUCSON, Ariz.-- Thousands from near and far came out to the Gem and Mineral Showcase’s opening weekend, but there was one geode that was getting more attention than others. Among the rock-solid ...

Forbes contributors publish independent expert analyses and insights. David Bressan is a geologist who covers curiosities about Earth. Discovered in 1999 during mining operations in the Mina Rica (the ...

Boulder, Colo., USA: 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 ...

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 ...

In 2019, Michal Mael brought a massive geode to the Kino Gem Show. It weighed thousands of pounds and had a heavy door attached — for everyone who has ever dreamed of being encapsulated by amethyst.

Any geode might make us wonder: What geologic forces form these hollows lined with crystals? But the Pulpí Geode, discovered in an abandoned Spanish mine, takes wonder to a different scale. One of the ...