Sol 758, September 24, 2014. The Mars Hand Lens Imager (MAHLI) took this close-up image showing surface texture and cracks in the Pahrump bedrock.
NASA description: Using an onboard focusing process, the Mars Hand Lens Imager (MAHLI) aboard NASA’s Mars rover Curiosity created this product by merging two to eight images previously taken by the MAHLI, located on the turret at the end of the rover’s robotic arm.
Sol 758 raw images (from all cameras), and Curiosity’s latest location map.