You never know what you're going to get when you crack open a geode-like rock called an agate ... a precious stone hotspot in southern Brazil, is a dead ringer for the blue, googly-eyed Sesame ...

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.

A group of scientists working with the enhydro agates found in Brazil wanted to test if they could contain microorganisms, as ...

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 ...