China Clay is also called Kaoline. One of the purest of the clays, composed for the most part of the mineral kaolinite usually formed when granite is changed by hydrothermal metamorphism. Usage of the terms china clay and kaolin is not well defined, sometimes they are used synonymously for a group of similar clays, and sometimes kaolin refers to those obtained in the United States and china clay to those that are imported. Some authorities term as china clays the most plastic of the kaolins. These clays are also used as a filler in making paper. It is found in Bhuj, Lakhpat, and RaparTalukas.