re: Fractal clumping of Mars Soil
...also an abundance of Lodestone may be the answer. At the same time, it may raise some questions as to Mars's past.
If Lodestone is present, then it means that Mars must have had a strong magnetic field at one time.
The Lodestone
That very dark, green material could very well be Olivine, but at the same time, it looks like it's clinging to other particles.
FWIW - Just a thought.