Geologists Crack 134-Million-Year-Old Mystery of Amethyst Geode Formation

New research from the University of Göttingen reveals that amethyst geodes in Uruguay formed at low temperatures from groundwater-like fluids, proposing a new model for their formation based on extensive geological surveys and innovative analytical methods. Amethyst, the violet variety of quartz, has been used as a gemstone for centuries and is a key economic [...]

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