This VIS image shows part of the bright material on the floor of Pollack Crater. Erosion by wind action has sculpted the material, forming the linear features that run from bottom right to upper left. The material, while brighter in contrast than the surrounding materials, is not white. Orbit Number: 66427 Latitude: -7.97233 Longitude: 25.1327 Instrument: VIS Captured: 2016-12-04 11:54 http://photojournal.jpl.nasa.gov/catalog/PIA21295

White Rock of Pollack Crater

Pollack Crater White Rock

White Rock of Pollack Crater

Pollack Crater White Rock

White Rock Landform in Pollack Crater

This observation captured by NASA Mars Reconnaissance Orbiter shows a small crater in within the much larger Pollack Crater containing light-toned material.

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. This false color image from NASA 2001 Mars Odyssey spacecraft shows part of the floor of Pollack Crater.

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image. Today's false color image shows part of the floor of Pollack Crater, including part of the fill material located on the floor. Orbit Number: 10947 Latitude: -8.06138 Longitude: 25.1671 Instrument: VIS Captured: 2004-06-02 16:54 http://photojournal.jpl.nasa.gov/catalog/PIA19776

This VIS image shows part of the floor of Pollack Crater. First imaged by Mariner 9, the high contrast between the crater floor and the bright feature, led to the informal name "white rock" for the bright floor feature. More recent images have shown that the floor of Pollack Crater is darker then normal in that part of the crater, which has produced the high contrast. THEMIS IR images of the feature indicate a composition produced by wind deposition, rather than water. Additionally, the deposit does not appear to be solid rock. The deposit is most likely a combination of dust and a more solid material. Taken together, the Mariner 9 image of white rock didn't hold up under careful study, it's not white and it's not rock! The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image. Orbit Number: 62872 Latitude: -8.53297 Longitude: 24.916 Instrument: VIS Captured: 2016-02-15 15:52 https://photojournal.jpl.nasa.gov/catalog/PIA23114

This infrared image, taken by NASA 2001 Mars Odyssey spacecraft, shows the feature called White Rock. The feature is dark, indicating that it is cooler than the surroundings.