A NASA rover taking rock samples on Mars has uncovered a plentiful mineral that was invisible to orbiters studying the Red ...

Scientists have pondered why Mars seemed to be missing sufficient carbonates indicative of its warm, wet past. Now, NASA’s ...

Now, a new study using data from NASA’s Curiosity Rover claims that sulfate layers on the Martian surface may have been hiding siderite—iron carbonate—from orbital survey missions.

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

In a paper published this month in the journal Science, data from three of Curiosity’s drill sites revealed an abundance of siderite—an iron carbonate mineral that had been a missing piece in ...

Explore the latest discoveries about Mars' ancient carbon cycle revealed by NASA's Curiosity rover in Gale Crater.

Siderite is an iron carbonate mineral. Its presence in sedimentary rocks formed billions of years ago offers evidence that Mars once had a dense atmosphere rich in carbon dioxide, a gas that would ...

In Gale Crater, Curiosity found nearly pure crystalline siderite, an iron carbonate mineral, filling a gap in the previously low quantities of carbonates detected on Mars. The discovery suggests ...