I posted the NASA site. It has a picture of a grind mark halfway down along with an explanation.
If you look at it, you can see that it is the same makeup as the one that started this thread.
ASA's Mars Exploration Rover Spirit took the images that make up this mosaic with its microscopic imager on sol 82. The mosaic reveals the drilled surface of the target called "New York" on the rock dubbed "Mazatzal."
[Edited on 30-3-2004 by Leveller]




