MadSci Network: Astronomy

Re: If Mars is so full of iron, why are the rocks gray?

Date: Tue Feb 17 19:01:40 2004
Posted By: Nicolle Zellner, Researcher, Institute of Geophysics and Planetary Physics
Area of science: Astronomy
ID: 1073845059.As

According to the Mars Rovers' website (1), the gray rocks are hematite, 
which is a mineral made up of iron and oxygen. The chemical interactions of 
these 2 elements give the rocks a gray color.  In powdered form, it is 
rust-colored and gives Mars the red color (2) we're so familiar with.


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