Medicinal clay
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The use of medicinal clay in folk medicine goes back to prehistoric times. Indigenous peoples around the world still use clay widely, which is related to geophagy. The first recorded use of medicinal clay goes back to ancient Mesopotamia.
German medicinal clay (Luvos Heilerde) consisting of loess, i.e., a mixture of sand, clay, and silt
A mountain of clay — Petrified Forest National Park, Arizona. The white bands represent pure bentonite clay.
Clay
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Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, Al2Si2O5(OH)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.
Gay Head Cliffs in Martha's Vineyard consist almost entirely of clay.
A quaternary clay in Estonia
A 23,500 times magnified electron micrograph of smectite clay
Italian and African-American clay miners in mine shaft, 1910