Opportunity in 2004 is visible inside Eagle Crater, at upper right in this April 8,
2017, observation by NASA’s Mars Reconnaissance Orbiter.
Credit: NASA/JPL-Caltech/University of Arizona
Stephen Clark of Astronomy Now wrote:
NASA has released the first high-resolution aerial colour image of the Opportunity rover’s landing site on a sprawling Martian plain, where the airbag-cushioned robot fortuitously rolled into a Eagle Crater in January 2004, putting its scientific instruments face-to-face with a block of sedimentary rock that gave ground teams confirmation Mars was once a warmer, wetter, and habitable planet.
Disregarding the sedimentary rock, which isn't obvious in the picture I posted, I'm interested in the colors of the picture at left. The ejecta made by the rover, at upper right, is light yellowish in color, whereas the overall color of the Martian soil where it touched down is dark grayish brown.
What is the light yellow color due to? Is it iron oxide?
By the way, check out the Astronomy Now page that I linked to in the quote, because there the image is labeled.