Identification: Fullers Earth is the name applied to certain clays that have the ability to adsorb coloring matter from vegetable, mineral and animal oils. Some of the Fullers Earth clays are not readily distinguishable from common clay, but in general the fullers earth found in Florida is light green to gray in color, has a greasy feel when wet, and has a low specific gravity. Fullers earth will not slake or disintegrate readily when placed in water, as will Kaolin.

Occurrence: Sizable deposits of fullers earth are known to occur in Gadsden County. Small deposits of clay similar to Fullers Earth are known in many other counties, and are often encountered in the drilling of wells.