https://www.avient.com/knowledge-base/article/what-s-difference-fillers-reinforcements?ind[]=21508
Kaolin, or white clay, is an aluminum silicate used in materials such as ceramics, paint, rubbers and plastics.
Several of these are white and can be used with a range of colorants. for example, is called “white graphite” because it has a hexagonal, platy structure like graphite.