That’s because spacecraft observations of the compounds had not identified traces of water, indicating the iron oxide must have appeared after all of Mars’ ancient lakes and rivers had evaporated.

Mars isn’t a bright, fire-engine red, but the iron oxide in its rocks makes it appear redder than other planets, especially ...

Iron-rich hematite, commonly found in rocks and soil, ... an iron oxide compound that is earth-abundant and much more environmentally friendly than materials currently used in spintronics. ...

Toward Cost-Effective High-Energy Lithium-Ion Battery Cathodes: Covalent Bond Formation Empowers Solid-State Oxygen Redox in Antifluorite-Type Lithium-Rich Iron Oxide. ACS Materials Letters , 2024 ...

image: Iron-rich Fe–O compounds at Earth’s core pressures view more . Credit: Jin Liu. Oxygen is the key substance for life and one of the most abundant elements in the Earth.

That’s because spacecraft observations of the compounds had not identified traces of water, indicating the iron oxide must have appeared after all of Mars’ ancient lakes and rivers had evaporated.