At 03:02:03 UTC the Mars Hand Lens Imager (MAHLI) imaged this very interesting rock from a distance of 32 mm, with a resolution of 0.0186 mm/pxl.
In this close-up shot we can see in detail a vein of gypsum, or calcium sulfate, as well as several sand grains of various colors.
This image has undergone white balancing to bring the color rendering closer to that of the human eye and a slight increase in micro-contrast.
HD processed image: https://image.ibb.co/fOXyvA/Curiosity-Sol2221.jpg
Original image (Focus merging): https://mars.jpl.nasa.gov/msl/multimedia/raw/?rawid=2221MH0001630000803150R00_DXXX&s=2221
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