What it is
Aluminum silicate is an inorganic mineral composed of aluminum, silicon, and oxygen, closely related to clay minerals. In cosmetics it is used as an absorbent and filler that helps take up excess oil, add bulk and opacity, and improve the slip and feel of powders and emulsions. It also contributes to a soft, matte finish and helps suspend pigments.
Safety & warnings
Aluminum silicate and related clay minerals have a long history of cosmetic use and are generally considered inert and well tolerated. As an inorganic mineral it is not a fragrance allergen and is not associated with comedogenicity from oils.
Origin & sourcing
Can be of natural mineral (clay) origin or produced synthetically; both yield an aluminum-silicon oxide material.
Questions everyone asks
What does aluminum silicate do in a formula?
It works as an absorbent and bulking mineral, soaking up excess oil, adding opacity, and improving the texture and slip of powders and creams.
Is it related to clay?
Yes, it is an aluminum-silicon mineral closely related to clay materials used in cosmetics.