NASA’s Mars rover Curiosity took this photo with her right mast camera on July 21, 2015 ( Sol 1051 ) near Marias Pass in Gale Crater, Mars. Red lines and red box mark branching structures in an artificial stone. This image possibly shows 8X magnification, as it has been enlarged 200% from its source displayed at http://mars.nasa.gov/msl/multimedia/raw/?rawid=1051MR0046240040104587E01_DXXX&s=1051