The newish/latest comet formation theory suggests that comets are aggregates of pebbles.
Parts of the surface here seem to be made of aggregated pebbles, but others are smoother. Neither are particularly dusty, he said. "There is no dust mobilisation in this part of the comet."
The pebbles are a good sign because they fit with one model of how comets, the building blocks of planets, form. This model suggests that tiny particles in the early solar system clumped together to form centimetre-scale pebbles, but these pebbles don't simply grow into larger and larger objects. Instead, the pebbles clump together while retaining their original shape. "This is exactly what we see with CIVA," said Poulet. "It's possible that the comet could be totally made of pebbles."
#RosettaWatch: New clues about the origin of comet 67P
While comets and asteroids are thought to be considered rocky material in the Electric Universe theory an aggregate or conglomerate comet and asteroid would not be out of the question or much of a surprise.
Perhaps more likely are parts of the surface made of aggregate/conglomerate including pebbles. But these are not collected together to form the matrix/matter but are formed of the material in that area, transmuted by the incredible electromagnetic energy and forces.
EU theory geology certainly suggests that stone/rock aggregates and conglomerates are the result of electromagnetic events and not ancient and very slow processes. For example you find conglomerate boulders at the Olgas near Ayers Rock.
Even the fact that this aggregate comet theory is being discussed with potential visual evidence is another sign that even the latest dirty iceball comet formation theory might be already past its sell by date.