In the image of the Pathfinder landing site above we see a variety of colors and textures of rocks. The image is somewhat color-enhanced, but not excessively so.
Note there are reddish, possibly sedimentary, rocks (arrowed in red); bluish, possibly volcanic, rocks (arrowed in blue); and there are whitish, possibly carbonate rocks (arrowed in white).
The Pathfinder did not detect the presence -- or the absence -- of carbonate at the Ares Vallis landing site and could not do so. However, given that the site is in the middle of a massive outflow channel that is widely thought to have been formed by outbursts of flooding water, the discovery of some carbonate rock here would not be surprising.
Of course there are many other whitish rock outcrops on Mars, most famously the White Rock itself. But none have been spectrally identified as carbonates to date.
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