Some of the unusual rocks carry stories about water on Mars. One has hints of long-gone microbes. All tell of a dynamic, complex planet.

All rocks are made of one or more minerals. Minerals are solid, naturally occurring substances with well-defined crystal ...

Unusual structures of unknown origin discovered in desert rocks have been documented in a new study. In the desert regions of ...

The Guinness World Record for the oldest Earth rock is currently held by the Nuvvuagittuq greenstone belt, which is listed as ...