Mark Sachs at One Small Step has a link to someone doing repair work on a set of images from Russian landers on Venus in the Seventies and Eighties. Very cool. While the first lander, Venera-9, landed in what looks like a typical Mars-esque rock pile, the other three, Venera-10, Venera-13, and Venera-14 are quite different. The ground is covered in flat, almost paving-quality rock, like irregular slate. The rock seems to have the crumbly quality of sandstone, but that probably has more to do with the highly reducing sulfuric-acid atmosphere than the actual composition of the material.