Four types of ore are found in the county, namely: The PISOLITIC, the COLITIC, the VESICULAR, and the AMORPHOUS. The pisolitic, or colitic, or an association of these two varieties make up the ore of most of the places. The deposits are interstratified with impure clays, kaolin, and bauxitic clays. At a number of places a bluish gray clay was encountered in the test pits below the beds of bauxite. Below this thick layer of clay a very black, lignitic clay was found in a few of the test pits. A high grade of Fuller's earth was found in large quantities four miles northeast of Pontotoc by Government mineralogists in the spring of 1935. This body of clay has never been used for commercial purposes, although applicants from Oklahoma, Mississippi and Tennessee have recently tried to get options on land where it is found.