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Geological surveys shed light on the formation mystery of Uruguay's amethyst geodesAmethyst geodes in Uruguay have been found in cooled lava flows, which date from the original breakup of the supercontinent Gondwana around 134 million years ago. However, their formation has ...
Ces scientifiques tentent de percer les mystères derrière la formation des géodes d'améthyste, présentes dans d'anciens flux de lave. Géode d'améthyste et de calcite du district de Los Catalanes, ...
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