Researchers studying amethyst geode formation in Brazil’s lava flows have proposed temperatures below 100 °C. The new study uses similar techniques and includes an additional oxygen isotope.

Graciela Sosa, Dr. Alfons van den Kerkhof. Credit: Fiorella Arduin Rode Amethyst geodes, in particular, contain violet quartz crystals, prized for centuries for their beauty and value. These rare ...

The three-meter tall amethyst geode - a hollow rock filled with amethyst ... and this was then secured in her own steel container and shipped out of Brazil to Brisbane, Australia.

Along with Ametista do Sul in southern Brazil, these regions are the world’s leading mining districts for gems which come from volcanic lava, such as amethyst and agate geodes. Amethyst is a ...

People view the 12-foot tall amethyst geode from Uruguay hosted at the American Museum of Natural ... [+] History in New York. Thanks to geological surveys and detailed chemical analysis ...

Some of the world's largest amethyst geodes come out of Artigas, Uruguay. The earth beneath this region is uniquely suited to producing amethyst. But other than size, what qualities do miners look ...

Along with Ametista do Sul in southern Brazil, these regions are the world’s leading mining districts for gems which come from volcanic lava, such as amethyst and agate geodes.