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Ingredient guide
magnesium aluminum silicate
In short
Magnesium Aluminum Silicate is a purified smectite clay that stabilises formulas and keeps particles evenly suspended. It helps create smooth, consistent textures, especially in mineral sunscreens.
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Works for
Texture
Best used
Anytime
What it is
Purified smectite clay used as a rheology modifier and suspension stabiliser; builds a thixotropic network in aqueous formulas that thins under shear and reforms at rest — widely used to keep mineral sunscreen particles in stable suspension.
Also found as
Related
Where to find it
CeraVe Hydrating Mineral Sunscreen Face SPF 50
La Roche-Posay Anthelios Mineral SPF 50
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Common questions
It thickens watery formulas and prevents pigments or minerals from settling, keeping textures even.
Yes, it’s inert and generally well tolerated.
Often in mineral sunscreens, lotions, and gels that need stable, uniform dispersion.
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Personal guidance only · For clinical concerns, see a dermatologist.