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 geodes in Uruguay have been found in cooled lava flows, which date from the original breakup of the supercontinent ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback