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Iowa's state rock, the geode, illustrates the adage that 'you can't judge a book by its cover,” said Marv Houg, president of the Cedar Valley Rocks and Minerals Society. 'It's a great teaching tool ...

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 ...