Search Results for: Other mineral substances
relatively hard clay and sandstone base is covered with a layer of looser sediments - sand, mud, silt, and pebbles. these are also derived from sources inland. the constant action of the sea breaks down, sorts, and redistributes these sediments. wave action on the beaches works sand grains against each other
plasticity, shrinkage under firing and under air drying, fineness of grain, color after firing, hardness, cohesion, and capacity of the surface to take decoration. on the basis of such qualities clays are variously divided into classes or groups; products are generally made from mixtures of clays and other...
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