Smithsonian researchers trekked to a remote site in northern Canada to collect four-billion-year-old rock samples that could ...

An abandoned mine in Spain hides a sparkling treasure – the world's largest geode, a natural crystal phenomenon that has stunned scientists. In abandoned silver mine in Pulpí, in Spain's south ...

The colors are produced by the propagation of polarized white light inside the minerals ... the second provides the idea of flow in rocks, with blocky crystals surrounded by a curved and folded ...

Taken by themselves, geodes are gorgeous, with the insides lined with crystals that add a sense of beauty and wonder to the rocks, and they become even more amazing when they are dinosaur eggs ...

These crystals are produced in molten rock as it travels from deep inside Earth to the surface. With increasingly sophisticated scientific methods, we can extract a secret history of volcanoes ...