Comparison of Frass2 sample and the Mazatzal rock on Mars

First the rock from Mars.  The original can be seen at:
http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20040401a/NewYork_Rat_2_MI_mosaic_MIPL-A087R1.jpg
 

Next is a picture I have just taken from the "Frass2" meteorite.  I have a number of pieces of this rock.  This picture comes from rock number 7, as seen in the sample overview picture on the Frass2 page.

Of course the second picture hasn't been "ratted" or polished in any way.  To bad the rovers couldn't afford a color microscopic camera.