In this book, the authors present current research in the study of the sources, properties and applications of phosphates. Topics include phosphates for seafood processing, zirconium phosphate as a versatile chemical carving board to produce solid, layered organic-inorganic materials; catalytic activity of ortho- and condensed phosphates; the role of phosphate transporters in skeletal and extraskeletal calcification; application of phosphates for metal immobilization and the thermodynamic stability of phosphate apatites.