Robert Webster's highly regarded work, Practical Gemmology, first published in 1943, has been through six editions and numerous reprints and was long considered the standard work for those learning the theory and science of gemmology. This classic, on which professional gemmology courses were founded, has been entirely revised by DeeDee Cunningham to return it to its esteemed place among current gemmological education books. Re-written and expanded, this completely updated book includes new material on high-tech treatments and synthetic diamonds as well as instrumentation, theory, testing and gemstone properties. Its nineteen lessons each serve as individual lectures and it pays considerable attention to covering all the background information and theory necessary for understanding every concept central to gemmological theory. Although suitable for readers of all levels of understanding, Practical Gemmology is specifically tailored to provide the information and diagrams necessary for the successful completion of diploma examinations and is an invaluable tool for gemmology students.
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The process of regional-residual separation in potential field is age-old. Broadly, there are two techniques for regional-residual resolution, viz., graphical and analytical. Both the techniques have their own respective shortcomings. In this book, the authors have described the technique based on finite element method in which only eight (or twelve) nodal observed gravity values are used for the regional computation, thereby eliminating the possible contamination of anomalous fields and also the technique does not assume an explicit model and physical properties like density of rocks etc. in the regional computation. The book discusses the advantages of this technique viz., it is not site-specific; the computation is independent of any prior assumptions as to the form and depth of shallow or deeper structures; it can handle data distributed at random or on a regular grid on the map space; and the neighbouring surveys join smoothly. The book focuses on application of this new technique which has been demonstrated in different fields, such as hydrocarbon, minerals and groundwater, structural studies, earthquake and engineering studies and impact structures.
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This guide is intended to show some of the much-prized rocks and minerals of the northwest. Some are valued for their beauty when cut and polished. Others are prized for the economic value of the metals they contain, such as copper in chalcopyrite, or of some physical property of the mineral itself, such as the fibrous nature of asbestos. Still other minerals are valued for their crystal form, or, simply as examples of the great diversity in the mineral kingdom.
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Since it was first published in 1962 `Gems', written by Robert Webster and revised in its fourth edition by Basil Anderson, has become universally recognised as the most comprehensive and authoritative treatise on gem materials in the English language. In this fifth edition, edited by Peter Read, the forty chapters, appendices and tables have been revised by fifteen gemmologists chosen for their expertise in the relevant sections. Aimed at the professional jeweller and student gemmologist, Gems also caters for the collector of gems and the layperson who is interested in precious stones.
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International Tables for Crystallography are no longer available for purchase from Springer. For further information please contact Wiley Inc. International Tables for Crystallography, Volume E, Subperiodic groups covers the seven frieze groups, the 75 rod groups and the 80 layer groups. The information tabulated for these groups is identical in format and content as that given for the 230 space groups in Volume A. In addition, scanning tables are given for each of the 230 space groups. These scanning tables give the largest subgroup of the space group that leaves the given plane invariant. The use of the scanning tables is shown in determining the symmetry of domain walls.
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Origin and Mineralogy of Clays, the first of two volumes, lays the groundwork for a thorough study of clays in the environment. The second volume will deal with environmental interaction. Going from soils to sediments to diagenesis and hydrothermal alteration, the book covers the whole spectrum of clays. The chapters on surface environments are of great relevance in regard to environmental problems in soils, rivers and lake-ocean situations, showing the greatest interaction between living species and the chemicals in their habitat. The book is of interest to scientists and students working on environmental issues.
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The new and fully updated edition of this popular advanced level textbook reviews the geological applications of techniques involving natural radioactive elements. Comprehensive coverage is given to both rock dating and isotopic tracer studies. Placing more emphasis on applications to the environmental sciences, this new edition covers the latest methods. First Edition Hb (1995): 0-521-43151-4 First Edition Pb (1997): 0-521-59891-5
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Clay Sedimentology is a comprehensive textbook divided into six parts: - clay minerals and weathering - clay sedimentation on land - origin and behaviour of clay minerals and associated minerals in transitional environments (estuaries, deltas) and shallow-sea environments - diverse origins of clay in the marine environment - post-sedimentary processes intervening during early and late diagenesis - use of clay stratigraphic data for the reconstruction of past climate, marine circulation, tectonics, and other paleogeographical aspects. A basic idea on most topics dealing with sedimentary clays is presented and controversial data and uncertainties from the frontiers of knowledge are discussed.
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