At 20:33:20 UTC the Mars Hand Lens Imager (MAHLI) captured this very close detail of a rock just partially cleaned by Curiosity’s rotating wire brush.
The photo was taken from a distance of only 6.9 cm with a definition of 0.032 mm/pixel, thus covering an area of 5.07 cm X 3.76 cm.
The concentric circular stripes are due to the abrasive action of Curiosity’s rotating wire brush, thanks to which it was possible to remove the reddish surface “dirt” and expose the true blue coloration of the underlying rock.
To show colors more similar to those that the human eye would see, I subjected the image to white balance and a slight increase in microcontrast and color saturation.
Original image: https://mars.jpl.nasa.gov/msl-raw-images/msss/02640/mhli/2640MH0007080011000859C00_DXXX.jpg
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