Kaolinite
Videos
Kaolinite is a clay mineral, with the chemical composition Al2Si2O54. It is a layered silicate mineral, with one "tetrahedral" sheet of silicate tetrahedra linked to one "octahedral" sheet of aluminat
Kaolinite structure, showing the interlayer hydrogen bonds
Kaolin mine in Czech Republic
A kaolin processing plant
Geophagia
Videos
Geophagia, also known as geophagy, is the intentional practice of consuming earth or soil-like substances such as clay, chalk, or termite mounds. It is a behavioural adaptation that occurs in many ani
Parrots eating earth
Five Japanese macaques eating soil
A five-year-old girl in Peru with a desire to eat earth (geophagia). Wood engraving by E. Riou, 1860s.
Several different rocks of clay-like material being sold at a local market in Kabwe, Zambia. These are usually purchased and consumed by pregnant women.