This image covers a well-preserved (relatively young) impact crater about 5 kilometers (3 miles) wide. The enhanced-color sample shows that the north-facing slope (on the south side of the crater) has a blue-green color but the south-facing slope has a yellowish color.

The blue-green (infrared-shifted) colors indicate minerals like olivine and pyroxene, common in lava or subsurface intrusions of magma. The yellowish color is typical of hydrous alteration or dust. This crater likely exposed diverse lithologies (rock types) that were present before the crater formed.
Written by: Alfred McEwen (audio by Tre Gibbs)   (30 January 2013)

This is a stereo pair with ESP_030290_1550 .

More info and image formats at http://hirise.lpl.arizona.edu/ESP_030079_1550

Image: NASA/JPL/University of Arizona