Researchers from the University of Göttingen in front of a giant amethyst geode in Uruguay. Geodes like this were discovered in cooled lava flows dating back to the original breakup of the Gondwana ...

Amethyst geodes (some over 16 feet high!) are located in cooled lava flows. These ancient lava flows can be traced to the breakup of the supercontinent Gondwana some 134 million years ago.

Amethyst is one of the most abundant crystals in the world, but the most prized pieces can cost almost a million dollars. Some of the world's largest amethyst geodes come out of Artigas, Uruguay ...

World-class amethyst-agate geodes from Los Catalanes, Northern Uruguay: genetic implications from fluid inclusions and stable isotopes. Mineralium Deposita, 2024; DOI: 10.1007/s00126-024-01310-2; ...