Jarosite. (Image by Rob Lavinsky, Wikimedia Commons).
Researchers trying to understand ice age cycles by examining deep ice cores in Antarctica found jarosite, a mineral that is abundant on the Martian surface.
In a study published in the journal Nature Communications, the scientists explain that this finding is important because it may help confirm previous theories that suggest there has been liquid water on Mars. This is because on Earth, jarosite is rare and when it forms, it does so as the result of low-temperature acidic-oxidative weathering of iron-bearing minerals in water-limited settings. It may also appear as a byproduct of zinc refining.