The amber found in Romania is sometimes called rumanite, a variety prized for its deep, reddish hues. It often forms in the ...

Prodigious siblings can be annoying. All too often, they steal the spotlight and cast behind them an infuriating shadow of ...

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.

It’s much easier to come up with a world-changing invention if there are examples of it lying around without you having to ...

Miners discover a one-of-a-kind amethyst crystal inside a large basalt geode in the Santa Rosa mine in Uruguay’s Artigas ...