Florida Geological Survey - Geology Topics
Identification: Common clay is a sticky,
plastic type of sedimentary rock that is composed primarily
of varying amounts of clay minerals, quartz sand, calcite,
iron oxides, organic impurities and other materials.
Most of the clay in Florida was originally deposited as a
mud in seas, lakes, rivers, or on deltas. Clay may
occur in a wide variety of colors depending upon its
mineralogical composition, impurities, and the amount of
weathering which it has undergone.
Occurrence: Common clay occurs in almost every
county north of the latitude of Lake Okeechobee.
Production and Use: The principal use of
common clay in Florida is as an addition to sand in the
construction of roads. Florida clays are also used in
the manufacture of Portland cement and lightweight