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 ...
We took a journey with some relatives out to the Dugway Goede Beds on a recent Saturday afternoon. We were accompanied by my sister-in-law’s family, who had been there before and knew where and what ...
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