Mineral found abundantly in sandstone, clay, and granite, as well as in parts of plants and animals. Silica can also be produced synthetically and is used as an absorbent powder and thickening agent in cosmetics. Certain forms of silica can improve even distribution of pigments in cosmetics and prevents them from settling in makeup.
Silica particles can enhance the absorption of other ingredients.
References for this information:
Biological and Pharmaceutical Bulletin, 2016, pages 1201-1205
Cosmetics & Toiletries, April 2015, pages 36-45