Leo, still not sure which image you are referring to. Could you post the image, or a link please ?
However this photo and the solid ice crust at the top of the cometseems to be suporting the idea that the interior of the comet should have a pumice struture of even some sort of solid ice funnel alike system, as a support for the ice top layer, MUPUS was not able to penetrate....
Why ? because the Comet density should be around 0.5 gr/cm^3. -Leo
Yes, that is the character of a "breccia-conglomerate", in geology.
... it looks like a loosely fused breccia-conglomerate 'rock', perhaps partially fused by kinetic energy of an impact or electrical strike. -s
Depending on the conglomerate's constituents, it can be heavier than dense concrete, or as light as a volcanic tuff.
It can be fused as hard as cast iron, or stuck all together much more loosely.
It depends on heat and pressure, at the time of formation.
An electric event would consolidate the matrix very quickly, which is why i've tentatively described it as "lightly fused".
Depending on original metallic and silicic content, there would be some fused or glassy, 'ice-looking' bits and some rocky/sandy/silty stuff, etc.
The electric fusing
would account also for the "chondrules," which Paladin17
has accureately described in a related thread.
[sortof like a nano-slag]
Another thing to consider in the pictures is that areas looking smooth and 'icey', may merely be 'fused pixels',
i.e. which have been overloaded by reflected sunlight, or excessive detail, and so a group of pixels
washed out and appear as a smooth area in the transmitted image.
More images to compare would settle that.