Clay minerals are typically formed over long periods of time by the gradual chemical weathering of rocks, usually silicate-bearing, by low concentrations of carbonic acid and other diluted solvents. Since ancient times, clay minerals have been investigated because of their importance in agriculture, ceramics, building and other uses. In this book, the authors present current research in the study of the types, properties and uses of clay. Topics discussed include clay mineral application in electrochemistry and wastewater treatment; organoclay/polymer nanocomposites; use of clays to manufacture honeycomb monoliths for pollution control applications; clays for the removal of dyes from aqueous solutions and structural modification of montmorillonite clays by the pillaring process.