Can you provide an image with scale bar?

The opjects (particles) may be composed of different grains, the constrast may stem from diffferent orientations.

Thanks a lot Dr. Stefan. Adding here the TEM image with scale bar

Stefan Baunack not only one or two particles but every particle shows this rib-like structure on it

It would be helpful if you add information about the imaging modes (TEM or STEM, bright field or dark field).

Images should be presented as uncompressed data (uncompressed TIF or PND), jpg can introduce artifacts.

I suggest - given the size of the objects - you see Moiré pattern here.

Stefan Baunack It is TEM Bright field