Alumina

Alumina, known in English and in the INCA nomenclature as "Betonite", is a natural mineral substance used in medicine and in cosmetic products. White clay is also known as kaolin.

Alumina has an absorbing effect, supports the formation of emulsions and improves the resistance and durability of emulsions; furthermore, alumina has a viscosity regulating effect (increases or decreases the viscosity of cosmetic products).
The natural mineral content changes the colour of the clay, so that the clay is available in many different colours, including red, green, white and grey (Umbra, Terra di Siena).
Due to its composition, clay can have a rough and coarse but also a fine and soft-greasy feel.
Kaolin, a white clay mineral, belongs to the group of fine-grained silicate minerals. The silicate mineral is of dry consistency, can be easily ground with the fingers and then takes on the structure of fine, soft, slightly greasy flour. Kaolin has a matte, rarely pearly shine.