Lovely day for a bit of rockhounding. Found agates, geodes, and the mild realization that we’re holding something older than ...

A scuba diving adventure in a Georgia river led to the discovery of agatized coral geodes hidden beneath the water. Watch as these incredible natural treasures are found, cut open, and reveal their ...

Amethyst geodes—some stretching 5 m long—dot the ancient lava flows of Uruguay’s Los Catalanes mining area. The geodes contain calcite, colorless quartz, and agate, another quartz mineral. Large ...