Rhassoul Clay is a brown clay only found in a valley in the Atlas mountains of Morocco. The term “rhassoul” comes from an Arabic word that means “to wash.”
 
Rhassoul clay contains silica, a component of sand. Natural silica can work as an exfoliant, and also gives hair a glossy sheen.
Rhassoul clay may cleanse impurities from the scalp as well as excess oil. At the same time, the exfoliating and conditioning properties of rhassoul clay could work to condition hair and give it volume.
 
A rhassoul clay hair mask coats your hair in minerals like sulfite and magnesium. These minerals may add strength, shine, and softness to your hair. 
A rhassoul clay hair mask doesn’t require any extra ingredients besides the clay powder and water.
You can add other ingredients like honey, rose water, or essential oils once you become more comfortable.
To make your own rhassoul clay hair mask, follow these steps: 
On average, rhassoul clay will need about 2 tbsp. of warm water for every 1 tbsp. of clay powder. Four to 5 tbsp. of clay is usually enough for one hair mask. Mix the warm water with the clay powder thoroughly, using a wooden spoon. For best results, use a wooden bowl, as a metal bowl may alter the charged particles in the clay.
Divide your dry hair into sections as if you were going to blow-dry or heat-style it. Apply the mask with your fingers starting at the roots of your strands and working back to the tips of your hair. Wear deposable gloves to cut down on mess.
Pay special attention to your scalp and make sure it’s coated well. Put a cap on your hair and let the mask soak in for 20 to 40 minutes.  
Rinse hair thoroughly with lukewarm water. You shouldn’t have to use shampoo or conditioner after you wash the mask off, but you can.