A researcher stands inside the Pulpí geode, the largest documented geode in the world, located at a depth of about 150 feet (50 meters) in a former silver mine in southeast Spain. Image via Hector ...

From one end to another, this giant geode is about as long as a small RV. If you wanted, you could comfortably house several adults within its dazzling interior. And the crystalline slabs that jut ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. The geological history that led to the formation of giant crystals and ...

Boulder, Colo., USA: The geode of Pulpí is an 11-meter hollow ovoid with crystal-paneled walls. It is like those familiar couplets of stone interiors covered with bright crystallites, but so large ...

Researchers from the University of Göttingen have investigated an intriguing geological phenomenon in Uruguay. These scientists are trying to uncover the mysteries behind the formation of amethyst ...