We offer china clay, one of the purest of the clays, is a hydrated aluminum silicate. It is composed chiefly of the mineral kaolinite usually formed when granite is changed by hydrothermal metamorphism available in lumps & powder form, in off white / snow white / super snow white color and in a fineness of up to 700 mesh ( max 0.5 % retention on sieve ) used in paints, foundry, detergent cake.