murphyMagnesium Aluminum Silicate
AKA: Aluminii magnesii silicas, Magnesium aluminium silicate
Synthetic
Clean
OriginMagnesium aluminum silicate belongs to the clay mineral family, composed of hydrated aluminum silicates with magnesium content. It is synthetically produced through acid activation and processing of natural clay minerals like montmorillonite or bentonite.
Silicic acid, aluminum magnesium salt
Solubility Insoluble
Formula
AlMgO4Si+
Mol. Weight
143.37
CAS #
1327-43-1
Form
Powder
State
Other Solid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Absorbent
Anticaking
Opacifying
Viscosity Controlling
Anti-Inflammatory
Moisturizing
Strengthens Barrier
Absorbs excess oil
Prevents clumping
Creates creamy opacity
Controls product thickness
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Eye Irritant in Testing
2 studies / 2 irritating / reactions minimal to moderate (CIR 288)
Mixed Skin Irritation Results
5 studies / 2 irritating / 1 mixed / 2 not irritating / reactions weak to moderate (CIR 288 and 808)
Concentration Guide
Leave-on0.0008–11%
Rinse-off0.0004–10%
0%50%100%
CIR reported use · 2018 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR