Geodes are hollow rock formations often with quartz crystals, such as amethyst, inside. Amethyst geodes in Uruguay have been found in cooled lava flows, which date from the original breakup of the ...

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Join us at the Idaho Museum of Mining and Geology, next to the Old Pen, for a fun afternoon of geode-cracking, a short and easy geo-hike on the nearby hillside and a museum visitation. Geode-cracking ...