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Geological surveys shed light on the formation mystery of Uruguay's amethyst geodesGeodes are hollow rock formations often with quartz crystals ... More information: Fiorella Arduin-Rode et al, World-class amethyst-agate geodes from Los Catalanes, Northern Uruguay: genetic ...
OKLAHOMA CITY (KFOR) — The outside of a geode might look like a simple rock, nothing special ... Sift through the sands of ...
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