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Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide .
While the term is usually applied to the red clay soils of the Southern United States, Ultisols are also found in regions of Africa, Asia, Australia and South America. In the World Reference Base for Soil Resources (WRB), most Ultisols are known as Acrisols and Alisols .
Expansive clay is a clay soil that is prone to large volume changes (swelling and shrinking) that are directly related to changes in water content. Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols.
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Pottery is fired ceramics with clay as a component. Ceramics are used for utilitarian cooking vessels, serving and storage vessels, pipes, funerary urns, censers, musical instruments, ceremonial items, masks, toys, sculptures, and a myriad of other art forms.
Silica in the soil that has been eaten by a woman shows up as white on this plain X-ray. Geophagia (/ ˌ dʒ iː ə ˈ f eɪ dʒ (i) ə /), also known as geophagy (/ dʒ i ˈ ɒ f ə dʒ i /), is the intentional practice of eating earth or soil-like substances such as clay, chalk, or termite mounds.