<p>Mineralogy — This target might be duricrust, which typically forms by the accumulation of soluble minerals deposited by mineral-bearing waters. 
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NASA/JPL/University of Arizona (289 km above the surface) <a rel="nofollow" class="external text" href="https://www.uahirise.org/PSP_006129_2075">www.uahirise.org/PSP_006129_2075</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/38719571645/">PSP_006129_2075</a>