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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 ...

MOUNT IDA — In and around Mount Ida, the identity of the official Arkansas State Mineral can be guessed just by looking around. In fact (pun alert!), the laureate is crystal-clear from billboards and ...

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 ...

In and around Mount Ida, the identity of the official Arkansas State Mineral can be guessed just by looking around. In fact (pun alert!), the laureate is crystal-clear from billboards and other signs.