Iron, a key material in steel and other applications, is most often found in hematite and magnetite ores, though goethite, limonite and siderite ores are also common sources of iron ore.

Because of the absence of liquid water on Mars’s surface today, its rusty red minerals were thought to arise from dry iron oxides present in the dust, such as hematite. However, new analysis of ...

A new study led by Brown University researchers shows a water-rich mineral could explain the planet’s color — and hint at its ...