A rock containing many smaller round stones could indicate that there was once a large amount of liquid water on the Red ...

A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.

Beneath the towering Guadalupe Mountains of Texas lies a dramatic story of transformation. Once part of an ancient sea, the fossilized Capitan Reef now forms craggy peaks and iconic cliffs like El ...

NASA’s Curiosity rover has uncovered a missing piece in the puzzle of Mars' past atmosphere. Scientists discovered ...

Every rockhound dreams of days like this! These are the greatest pieces I’ve ever uncovered, featuring flawless agates, vibrant amethyst, UV-reactive yooperlites, and perfect geodes cracked open to ...

The finest example of Rhodochrosite in the world is on display in Denver, Colorado, at the Denver Museum of Nature and ...