A piece of Mars: Wind ha blown the dark, rippled sand between jagged hills, from top to bottom in this frame (663 m or 2175 ft across). Regardless of the terrain, sand finds a way to get through -- just like at the beach, it manages to get everywhere. (HiRISE ESP_037494_1685, NASA/JPL/Univ. of Arizona)
Sirenum Fossae August 7, 2013 The martian crust expanded and cracked in patterns radial to the great Tharsis Bulge; one suite of troughs and cracks is the Sirenum Fossae. This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows two troughs and the bouldery debris shed from their walls.
Martian Crater Rich in Opal- The CRISM imaging spectrometer on board the Mars Reconnaissance Orbiter identified the minerals present in this crater south of Baldet Crater. Among them: a form of hydrated silica better known as the gemstone opal. The colors of the landscape don't appear as they would to the human eye, because instead of the usual red, green, and blue components of photographs, this image comes from infrared, red, and blue/green sensors. NASA/JPL/University of Arizona
"A piece of Mars: This is the edge of the northern polar cap on Mars. At the top is the bright icy surface, which is abruptly cut by a cliff. The wall of the cliff shows many layers of different materials — the darker ones are old dunes ... It blows my mind." http://cosmicdiary.org/lfenton/2012/06/19/the-edge-of-the-ice/
Northeast of Hellas basin (in Mars southern hemisphere) are ancient sequences of clay-bearing layered rocks. Cropped from PSP_010839_1525. The image covers an area about 750 meters wide by 1.25 kilometers tall. NASA / JPL / UA
Fresh Martian Crater: The High Resolution Imaging Science Experiment (HiRISE) camera aboard our Mars Reconnaissance Orbiter acquired this closeup image of a "fresh" (on a geological scale, though quite old on a human scale) impact crater in the Sirenum Fossae region of Mars on March 30, 2015.