Don't forget where we are on Mars.
In the middle of a giant crater, theoretically on top of some hills
that were more than likely formed by the rebound effect of the huge amount of energy unleashed when the crater was created..
A frozen splash, if you will.
there are bound to be all types of exotic mineral combinations, due to the melting, the fracturing, etc...
If you go back to the period of time when Spirit began to climb these hills..
Somewhere around Sol 300, I think...You can find lots of what is depicted
in the photo..
Literally fields full of these rocks...with similar erosion patterns..
I can try and go back and find some of these...could take some time.
TWO YEARS worth of photos to go through..