China Clay

hina Clay

China clay is one of the purest of the clays, composed chiefly of the mineral kaolinite usually formed when granite is changed by hydrothermal metamorphism. China clays have long been used in the ceramic industry, especially in fine porcelains, because it can be easily molded, have a fine texture, and are white when fired. These clays are also used as filler in making paper.

China clay occurs in the deposits in the form of china clay rock, a mixture of up to 15 per cent china clay and up to 10 per cent mica, and the remainder being quart.