What is rhassoul / ghassoul clay used for?

Rhassoul — spelled ghassoul too, from the Arabic for "washing" — is one of Morocco’s genuine natural treasures, and it surprises people that it comes from one specific place: it is mined from ancient deposits in the Atlas Mountains of eastern Morocco, near Boulemane, and almost nowhere else. It arrives as dry brownish flakes or a slab, and the therapist mixes it with warm water, or rose- or orange-blossom water, into a silky chocolate-coloured mud. The texture alone is lovely — far smoother and silkier than the gritty clay masks you might know.

In the hammam ritual it has a clear job, and a clear place in the sequence. After the steam softens you and the kessa scrub exfoliates, the rhassoul comes next: it is smoothed all over the skin, and often through the hair and scalp, then left to sit for a few minutes while you rest in the warmth before being rinsed off with bowls of warm water. Because it is mineral-rich and naturally absorbent, it draws out excess oil and impurities, lifts away the last of the dulled skin, and somehow leaves you soft rather than tight or stripped.

It is genuinely versatile, which is why Moroccan women have used it at home for centuries. As a hair treatment it cleanses without the harshness of detergent shampoo, leaving hair light and glossy; as a face mask it suits oily and combination skin especially well; and as a full-body mask it is the deep-cleansing heart of a spa day. Some spas blend it with argan, rose or herbs for added scent and nourishment, so no two rhassoul treatments feel quite identical.

My honest take: rhassoul is the underrated star of the Moroccan spa — everyone talks about the scrub and the argan, but the clay step is what leaves your skin feeling truly clarified. It is gentle enough for most skin types, though very dry or sensitive skin should keep it brief and follow with plenty of oil. It also makes a fantastic, lightweight souvenir; buy genuine Atlas rhassoul (check it is the real mineral clay, not a perfumed substitute) from a herbalist or cooperative. Tell your therapist about any sensitivities before they apply it.