Geodes, crystals bursting out of a rocky shell ... visit stalactite- and stalagmite-rich Perry's Cave, the limestone center of a family fun center in Put-in-Bay. The complex, located at 979 ...

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 ...