What is clay and what is it used for?
Clay is a natural rock or soil material with a fine grain which usually contains clay minerals. The color of clay can also vary greatly, from white to brown to an orange-red, depending on the soil’s content. Clays can be quite plastic when mixed with water, hard when it is dried, and permanently altered both physically and chemically if heated. Clay can be used for decorative purposes and as construction products – e.g. bricks and tiles. Loam, a mixture of clay, silt, and sand, is one of the oldest building materials in the world. An estimated third of the population still reside in buildings created with clay. The versatility of clay makes it an ideal substance for a variety of natural building techniques.