Geological surveys shed light on the formation mystery of Uruguay's amethyst geodes
Oct 03, 2024
Amethyst is a violet variety of quartz that has been used as a gemstone for many centuries and is a key economic resource in northern Uruguay. Geodes are hollow rock formations often with quartz crystals, such as amethyst, inside.
https://phys.org/news/2024-10-geological-surveys-formation-mystery-uruguay.html
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