Every now and then, one of the robots on Mars sends back a picture of an unusual rock it has found on its journeys. After all, that's one of the reasons we sent them there. These can range from the ...

The minifridge-sized rock, studded with green crystals, doesn’t dazzle; it bewitches. Many have coveted it. Some have died coveting it. A few have been sent to prison over it. People ...

An extraordinary journey: The atomic make-up of small crystals in the rock reveals ... And this is where our small green sandstone rock comes into the story. Those mid-Pliocene sea-levels imply ...

For centuries, mineralogists believed the green crystals to be a variation of another ... London The mineral was discovered within a rock specimen that has been at the Natural History Museum ...