re: The best analogue I have found...
Well, soil has high iron content perhaps they are held together with weak magnetic charge.
Btw, are there any lightening storms on Mars? It seems to be with all that fine dust flying around at 300 mph this should create static charge.
If the atmosphere is too thin to conduct electricity, perhaps different regions of mars have different amounts electrical polarity- if so, could you have "ground lightening" or some phenemon in which electrical charge is conduct near the surface to other regions with different charge?