The dig site was originally analyzed in the 1950s, when archeologists found an iron oxide mineral called hematite and a waste ...

Paleontologists have confirmed that a rock enclosing a perfectly round agate crystal is actually a titanosaur egg, which was probably smothered by lava after a volcanic eruption 67 million years ago.

The moon’s surface formed at least 40 million years earlier than previously thought, according to a new study of an ancient crystal embedded in rock collected by Apollo 17 astronauts. For years, ...