This is one I find fascinating. It looks like a giant hailstone. I wouldn't be surprised if ice was involved since it is in the south polar region. I'm uncertain about the height although it does appear to be elevated about 130 feet. The elevation doesn't drop off on the "dark side" of it so I don't know if it is jutting out from the side of the crater or if it is an individual object in its own right.
This HRSC picture gives a little more detail:
http://viewer.mars.asu.edu/planetview/inst/hrsc/H4408_0000_ND3#start
Coordinates: 70°38'40.91"S 48°16'50.02"E
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