Clays are hydrated aluminum minerals, which contain iron, magnesium and alkali metals. They are formed by the erosion of various rocks due to weather conditions, and usually form very thin grains with special colors. They are key ingredients in cosmetology and soap-making, for the production of exfoliating and cleaning products. Clays remove impurities in depth, stimulate the skin, and pamper the epidermis in many ways, depending on the properties of each type.