Moroccan Lava Clay
Rhassoul clay
No meaningful concern for most people; irritation is possible but rare.
Also written as: Rhassoul · Ghassoul · Rhassoul Clay · Moroccan Red Clay
What it is
Moroccan lava clay, better known as rhassoul or ghassoul, is a smectite clay mined from deposits in the Atlas Mountains. It has been used in North African bathing traditions for centuries as a soap substitute for skin and hair. Like other smectites it swells in water, absorbs oil and forms a smooth spreadable paste.
How it shows up on a label
The INCI name 'Moroccan Lava Clay' and the marketing name 'rhassoul' refer to the same material.
What it does well
Cleanses and absorbs oil without surfactants
Rhassoul lifts oil and dirt physically rather than chemically, which is why it appeals to people whose skin reacts to detergents. The evidence base is centuries of use rather than controlled trials.
Traditional use
Worth knowing
Can be drying with frequent use
As a swelling clay it removes sebum efficiently, and using it several times a week can leave skin or hair feeling stripped. It carries the same trace mineral content as any mined clay.
Matters most toPeople with dry skin or hair, or a compromised barrier.
Where the EU stands
Class entry may apply
Moroccan lava clay is named in none of the annexes of the Cosmetics Regulation. The 2026 aluminium class entry - Annex III entry 381, added by Regulation (EU) 2026/909 - is why that sentence now needs qualifying for most clays, since from 1 January 2027 it caps aluminium in the finished product at 0.89% (as Al) for face and body rinse-off products regardless of whether an ingredient is listed by name. This is the clay it is least likely to reach. Rhassoul is a magnesium smectite: the Moroccan clay sold under that name consists essentially of stevensite, with calcite, dolomite and quartz, and that stevensite has been measured at Si3.78Al0.22Mg2.92Fe0.09Na0.08K0.08O10(OH)2.4H2O, so aluminium is a minor substituent rather than a structural component. No concentration limit attaches to it, and the general safety assessment every cosmetic product must pass before sale applies as before.
Regulation (EC) No 1223/2009 - no annex entry; Annex III entry 381 (aluminium-containing ingredients), added by Regulation (EU) 2026/909 and renumbered from 379 by the corrigendum at OJ L, 2026/90354, 5.5.2026 · source ↗
Sources (2)
Every link goes to the original: a journal, a PubMed record or an EU document.
- [1]Interfacial electrochemical properties of natural Moroccan Ghassoul (stevensite) clay in aqueous suspension
Heliyon · 2020 · doi:10.1016/j.heliyon.2020.e03634
X-ray diffraction, BET and thermal analysis of the Moroccan clay sold as ghassoul found it consists essentially of stevensite with calcite, dolomite and quartz - the basis for treating rhassoul as a magnesium clay rather than an aluminium one.
- [2]Adsorption of metal ions onto Moroccan stevensite: kinetic and isotherm studies
Journal of Colloid and Interface Science · 2005 · doi:10.1016/j.jcis.2004.08.168
Characterisation of the Moroccan stevensite sold as rhassoul gives its formula as Si3.78Al0.22Mg2.92Fe0.09Na0.08K0.08O10(OH)2.4H2O, confirming a magnesium clay in which aluminium is a minor substituent.
