White clay is sometimes called kaolin, named after the Chinese city Kao-Ling where it was discovered. It is one of the main ingredients used in natural beauty products, naturopathy, and treating animals. It is quite common for clay plaster to be used to dress a lame horse.
White clay, which can also be harvested in France (the clay we particularly appreciate), is naturally rich in metals and due to its structure has a high absorption capacity. Its efficacy means it is often used in purifying products to capture sebum and impurities.