It is not truly unique. Look at these Martian Spiders:
It actually also compares quite well with Tycho Crater on the Moon which is, under the electric universe theory, not an impact crater but an electric discharge "lightning" pimplea huge one, but a lightning pimple none-the-less with the striations approaching it the remnants of the underground paths of the amassing electrons as they rush to join the massive plasma arc leaving the moon.
Note the striations, that have always been explained as ejecta paths, do NOT point directly toward (or away from) the center of "impact." They cannot be ejecta paths which would follow a ballistic path directly away from the point of impact. Note also that the stria on the Mercury Spider also do not point directly away from the point of impact.
Cool! Yeah, I was kinda wondering how really unique the Mercury “spider” is. I was thinking that it was either volcanic or an asteroid hit from when the surface was still semi-molten, but I wouldn’t consider lightning (or other electrostatic discharge) a bad theory at all.