A study suggests Mars takes its red hue from a type of mineral that forms in cool water, which could reveal insights about whether Mars was ever able to support life.

The iron oxide is no longer a pure metal ... They represent the number of atoms of each element in the formula. For example, CO₂ contains one carbon atom and two oxygen atoms.

For example, titanium dioxide nanoparticles can be used for photocatalytic degradation of organic pollutants in water, while iron oxide nanoparticles can be used for the adsorption and removal of ...

namely iron oxide, in the planet's dust. That's the same compound that gives your standard "rust" on Earth its red color. Scientists already knew that on Mars, over billions of years, iron oxide ...

Previous analyses of iron oxide on Mars, based only on observations ... that they don’t really have a defined crystal structure and can’t be called true minerals,” Horgan said.