I've found this APOD dated 2006 May 15 
Astronomy Picture of the Day
Volcanic Bumpy Boulder on Mars
Explanation: What created this unusually textured rock on Mars? Most probably: a volcano. Dubbed Bumpy Boulder, the strange stone measuring just under
a half-meter high was found by the robotic Spirit rover currently rolling across Mars. Pits on the ragged rock are likely vesicles and arise from hot
gas bubbling out of hot rock ejected by an active Martian volcano. Several similar rocks are visible near Bumpy Boulder that likely have a similar
past. The above true-color image was taken about one month ago.
Credit: Mars Exploration Rover Mission, Cornell, JPL, NASA
apod.nasa.gov...
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