Uruguay's Amethyst Geodes Mystery
This is a Uruguay news story, published by ScienceDaily, that relates primarily to Gondwana news.
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amethyst crystalliseScienceDaily
•Mystery of Uruguay's amethyst geodes: New model to explain amethyst formation
77% Informative
Geodes are hollow rock formations often with quartz crystals, such as amethyst, inside.
They date from the original breakup of the supercontinent Gondwana around 134 million years ago .
Amethyst geodes in Uruguay have been found in cooled lava flows.
Formation of these geodes has remained a mystery.
Researchers propose new model to explain their formation.
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