Mineral supplements are receiving a great deal of attention and experiencing a tremendous period of growth. Despite their popularity, questions continue to arise regarding the research behind their claims, the efficacy of different forms, and their overall safety. It is critical for the health care community and the general public to have an unbiased source of authoritative information.
' is really valuable and useful. It is not only a reference book but moreover a complete and rigorous study treatise, indispenssable for all prsons who need to learn about iron and its compounds, including the organic complexes and microbiological reactions. It plainly satisfies these aims and should be compulsory reading for university and research institute libraries. It is valuable for any scientist related with soil science, geology, sedimentology, geochemistry, mineralogy, or, more in general, anybody connected with the geosciences. It also provides a very good, up to date revision of iron literature up to 1987 and is, therefore, a rich source of information.' Geoderma, 47:1
Probably more than any other element, iron markedly influences the chemical and physical properties of soils and sediments in the earth. Considering its transition metal status, with potential variation in electronic configuration, ionic radius, and magnetic moment, combined with its abundance and relatively large mass, little wonder that one sees its unique influence on every hand. Pre- sentations at the NATO Advanced Study Institute (NATO AS!) on Iron in Soils and Clay Minerals reviewed and discussed the occurrence, behavior, and properties of Fe-bearing minerals found in soils and in the clay mineral groups kaolinite, smectite, and mica. Also discussed at the NATO AS! were the basic chemical properties of Fe, methods for separating and identifying Fe in minerals, and the role of Fe minerals in weathering and other soil-forming processes. The present publication is the reviewed and edited proceedings of that Advanced Study Institute. The sequence of chapters follows the general pattern beginning with introductory chapters which overview the general occurrence of Fe in the earth and its chemistry, both generally and in mineral environments, followed by identification and characterization methods for Fe and Fe phases in minerals. The properties and behavior of Fe oxides, Fe-bearing clay minerals, and other Fe minerals in soils are then described, and the text ends with a summary of the role of Fe in soil-forming processes. A Table of Contents and subject index are provided to assist the reader in finding specific topics within the text.