https://www.cnet.com/news/nasa-mars-rover-curiosity-spots-peculiar-pebbles/

Software engineer Kevin M. Gill, who wrangles data for NASA and processes space images (like this gorgeous Jupiter shot), offered up an enhanced version of the pebble field that really helps the grayer stones stand out from the others.

Curiosity's raw images from March 23 and 24 are full of different views of these rocks. The rover team is investigating the pebbles to learn more about their chemical makeup.