Chaos fabric is what makes up the primordial particles and primordial string that Source particles are made of. Chaos fabric is weird and moderately unstable.
Composition of higher objects
Primordial particles have a higher density of chaos fabric on the top and the left sides, while it has less in the center. Primordial string is made with one edge being made with a higher density of chaos fabric than the other edge, which has less chaotic fabric than the middle. The inside of a primordial string is more dense with chaos fabric.
Chaos fabric itself
The fabric is weird and moderately unstable. If you whack it too hard, it will create a small explosion, but it won’t self-destruct. If you split a chaos fabric, an explosion that could destroy an entire Xenoverse will be triggered! Why? A different reason than atoms. Chaos fabric will also repel nearby chaos fabric and will attract faraway chaos fabric. It sometimes also flings itself away from it‘s primordial particles or primordial strings. It is made of primordium particles and rogue ·s that never transformed into blueprint particles.