Quick impressions/interpretations (you may need to zoom in on this image):

A - Dark grey pebble: not the first time we’ve seen something like this - a grey pebble embedded in the rock like a chocolate chip in cake batter - but always worth pointing out. Most residents of Earth wouldn’t pay the least attention to this sort of pebble, but you don’t see them on Mars so much, right? This rock fragment appears to be solidly intact and mostly unaltered.

B and C - Small light grey fragments: these ones are very flattened compared to A (likely softer material than fragment A), but don’t display many “spots” of different colour.

D - Small light grey fragment with spots: Compared to A, B and C, there are more “blemishes”, if you will - white flecks and a darker grey spot.

E - Whitish zone: Perhaps something that originally resembled D, now further altered?

The above interpretation presumes that all of the little fragments originally resembled A, which is not a safe assumption, but clearly these little pieces have seen some things and have a story to tell.

Whitish material has often proven to be a soft sulfate mineral, like gypsum, which is a sign of significant alteration by water, after the rock was originally laid down. We’ve seen signs of aqueous activity not far from here, so I wouldn’t be surprised if this is again the case.

One striking thing about all of the fragments in this rock is how rounded they are. Impact breccia (from the asteroid strike that made Jezero Crater) often shows fragments with sharp, angular edges (here’s one example from Earth, or this one, from Luna), thrown out and mixed in by the impact itself. Here, though, it’s hard to find any sharp corners in the embedded fragments. Fun times!