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  • 1
    Monograph available for loan
    Monograph available for loan
    Washington, D.C. : Mineralogical Society of America
    Associated volumes
    Call number: 11/M 99.0611
    In: Reviews in mineralogy
    Description / Table of Contents: This volume was written in preparation for a short course by the same title, sponsored by the Mineralogical Society of America, October 22 and 23, 1999 in Golden, Colorado, prior to MSA's joint annual meeting with the Geological Society of America. Research emphasis in traditional mineralogy has often focused on detailed studies of a few hundred common rock-forming minerals. However, scanning the contents of a current issue of American Mineralogist or Canadian Mineralogist, or the titles of recent Reviews in Mineralogy volumes reveals that the emphasis of mineralogical research has undergone considerable change recently. Less-common, low-temperature minerals are receiving ever increasing attention, often owing to their importance to the environment. A tremendous challenge lies ahead for mineralogists and geochemists: the occurrences, structures, stabilities, and paragenesis of perhaps a thousand low-temperature minerals require detailed study if geoscientists are to be properly equipped to tackle environmental problems today and in the future. In many low-temperature environments mineral assemblages are extremely complex, with more than 10 species common in many em-size samples. This Reviews in Mineralogy volume provides detailed reviews of various aspects of the mineralogy and geochemistry of uranium; hopefully the reader will benefit from this presentation, and perhaps more importantly, the reader may develop a sense of the tremendous amount of work that remains to be done, not only concerning uranium in natural systems, but for low-temperature mineralogy and geochemistry in general. The low crustal abundance of uranium belies its mineralogical and geochemical significance: more than five percent of minerals known today contain uranium as an essential constituent. Uranium is a geochemical and geochronological indicator, and the U-Pb decay series has long been one of the most important systems for dating rocks and minerals. Uranium is an important energy source, and the uranium nuclear fuel cycle has generated a great deal of interest in uranium mineralogy and geochemistry since the first controlled nuclear fission reaction nearly sixty years ago. Current interest in uranium mineralogy and geochemistry stems in large part from the utilization of uranium as a natural resource. Environmental issues such as coping with uranium mine and mill tailings and other uranium-contaminated sites, as well as permanent disposal of highly radioactive uranium-based nuclear fuels in deep geologic repositories, have all refocused attention on uranium. More than twenty years have passed since the 1978 Mineralogical Association of Canada's Short Course on Uranium Deposits. A realignment of research focus has clearly occurred since then, from exploration and exploitation to environmental remediation and geological "forecasting" of potential future impacts of decisions made today. The past decades have produced numerous remarkable advances in our understanding of uranium mineralogy and geochemistry, as well as technological and theoretical advances in analytical techniques which have revolutionized research of trace-elements, including uranium. It was these advances that provided us the impetus to develop this volume. We have attempted to produce a volume that incorporates most important aspects of uranium in natural systems, while providing some insight into important applications of uranium mineralogy and geochemistry to environmental problems. The result is a blend of perspectives and themes: historical (Chapter 1), crystal structures (Chapter 2), systematic mineralogy and paragenesis (Chapters 3 and 7), the genesis of uranium ore deposits (Chapters 4 and 6), the geochemical behavior of uranium and other actinides in natural fluids (Chapter 5), environmental aspects of uranium such as microbial effects, groundwater contamination and disposal of nuclear waste (Chapters 8, 9 and 10), and various analytical techniques applied to uranium-bearing phases (Chapters 11-14).
    Type of Medium: Monograph available for loan
    Pages: 679 S.
    ISBN: 0-939950-50-2 , 978-0-939950-50-8
    ISSN: 1529-6466
    Series Statement: Reviews in mineralogy 38
    Classification:
    Mineralogy
    Language: English
    Note: Chapter 1. Radioactivity and the 20th Century by Rodney C. Ewing, p. 1 - 22 Chapter 2. The Crystal Chemistry of Uranium by Peter C. Burns, p. 23 - 90 Chapter 3. Systematics and Paragenesis of Uranium Minerals by Robert Finch and Takaski Murakami, p. 91 - 180 Chapter 4. Stable Isotope Geochemistry of Uranium Deposits by Mostafa Fayek and T. Kurtis Kyser, p. 181 - 220 Chapter 5. Environmental Aqueous Geochemistry of Actinides by William M. Murphy and Everett. L. Shock, p. 221 - 254 Chapter 6. Uranium Ore Deposits: Products of the Radioactive Earth by Jane Plant, Peter R. Simpson, Barry Smith, and Brian F. Windley, p. 255 - 320 Chapter 7. Mineralogy and Geochemistry of Natural Fission Reactors in Gabon by Janusz Janeczek, p. 321 - 392 Chapter 8. Geomicrobiology of Uranium by Yohey Suzuki and Jillian F. Banfield, p. 393 - 432 Chapter 9. Uranium Contamination in the Subsurface: Characterization and Remediation by Abdessalam Abdelouas, Werner Lutze, and H. Eric Nuttall, p. 433 - 474 Chapter 10. Uranium Mineralogy and the Geologic Disposal of Spent Nuclear Fuel by David Wronkiewicz and Edgar Buck, p. 475 - 498 Chapter 11. Spectroscopic Techniques Applied to Uranium in Minerals by John M. Hanchar, p. 499 - 520 Chapter 12. Infrared Spectroscopy and Thermal Analysis of the Uranyl Minerals by Jiri Cejka, p. 521- 622 Chapter 13. Analytical Methods for the Determination of Uranium in Geological and Environmental Materials by Stephen F. Wolf, p. 623 - 652 Chapter 14. Identification of Uranium-bearing Minerals and Inorganic Phases by X-ray Powder Diffraction by Frances C. Hill , p. 653 - 680
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Description / Table of Contents: PREFACE Sulfate is an abundant and ubiquitous component of Earth’s lithosphere and hydrosphere. Sulfate minerals represent an important component of our mineral economy, the pollution problems in our air and water, the technology for alleviating pollution, and the natural processes that affect the land we utilize. Vast quantities of gypsum are consumed in the manufacture of wallboard, and calcium sulfates are also used in sculpture in the forms of alabaster (gypsum) and papier-mâché (bassanite). For centuries, Al-sulfate minerals, or “alums,” have been used in the tanning and dyeing industries, and these sulfate minerals have also been a minor source of aluminum metal. Barite is used extensively in the petroleum industry as a weighting agent during drilling, and celestine (also known as “celestite”) is a primary source of strontium for the ceramics, metallurgical, glass, and television face-plate industries. Jarosite is a major waste product of the hydrometallurgical processing of zinc ores and is used in agriculture to reduce alkalinity in soils. At many mining sites, the extraction and processing of coal or metal-sulfide ores (largely for gold, silver, copper, lead, and zinc) produce waste materials that generate acid-sulfate waters rich in heavy metals, commonly leading to contamination of water and sediment. Concentrated waters associated with mine wastes may precipitate a variety of metal-sulfate minerals upon evaporation, oxidation, or neutralization. Some of these sulfate minerals are soluble and store metals and acidity only temporarily, whereas others are insoluble and improve water quality by removing metals from the water column. There is considerable scientific interest in the mineralogy and geochemistry of sulfate minerals in both high-temperature (igneous and hydrothermal) and low-temperature (weathering and evaporite) environments. The physical scale of processes affected by aqueous sulfate and associated minerals spans from submicroscopic reactions at mineral-water interfaces to global issues of oceanic cycling and mass balance, and even to extraterrestrial applications in the exploration of other planets and their satellites. In mineral exploration, minerals of the alunite-jarosite supergroup are recognized as key components of the advanced argillic (acid-sulfate) hydrothermal alteration assemblage, and supergene sulfate minerals can be useful guides to primary sulfide deposits. The role of soluble sulfate minerals formed from acid mine drainage (and its natural equivalent, acid rock drainage) in the storage and release of potentially toxic metals associated with wet-dry climatic cycles (on annual or other time scales) is increasingly appreciated in environmental studies of mineral deposits and of waste materials from mining and mineral processing. This volume compiles and synthesizes current information on sulfate minerals from a variety of perspectives, including crystallography, geochemical properties, geological environments of formation, thermodynamic stability relations, kinetics of formation and dissolution, and environmental aspects. The first two chapters cover crystallography (Chapter 1) and spectroscopy (Chapter 2). Environments with alkali and alkaline earth sulfates are described in the next three chapters, on evaporites (Chapter 3). barite-celestine deposits (Chapter 4), and the kinetics of precipitation and dissolution of gypsum, barite, and celestine (Chapter 5). Acidic environments are the theme for the next four chapters, which cover soluble metal salts from sulfide oxidation (Chapter 6), iron and aluminum hydroxysulfates (Chapter 7), jarosites in hydrometallugy (Chapter 8), and alunite-jarosite crystallography, thermodynamics, and geochronology (Chapter 9). The next two chapters discuss thermodynamic modeling of sulfate systems from the perspectives of predicting sulfate-mineral solubilities in waters covering a wide range in composition and concentration (Chapter 10) and predicting interactions between sulfate solid solutions and aqueous solutions (Chapter 11). The concluding chapter on stable-isotope systematics (Chapter 12) discusses the utility of sulfate minerals in understanding the geological and geochemical processes in both high-and low-temperature environments, and in unraveling the past evolution of natural systems through paleoclimate studies. We thank the authors for their comprehensive and timely efforts, and for their cooperation with our various requests regarding consistency of format and nomenclature. Special thanks are due to the numerous scientists who provided peer reviews, which substantially improved the content of the chapters. This volume would not have been possible without the usual magic touch and extreme patience of Paul H. Ribbe, Series Editor for Reviews in Mineralogy and Geochemistry. Finally, we thank our families for their support and understanding during the past several months.
    Pages: Online-Ressource (VIII, 608 Seiten)
    ISBN: 0939950529
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 20 (1981), S. 2463-2469 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1467-9310
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: International evidence shows that research is increasingly being carried out in organisational forms built around cross-sectoral (government, academic and business) and transdisciplinary teams with well-defined national social, economic or environmental objectives in view. As a result, new and unfamiliar forms of organisational arrangements for research are emerging within universities and elsewhere. These collaborative research centres have been variously termed ‘hybrid’ or ‘parasitic’. This paper draws upon around 30 in-depth interviews with participants from selected Australian Cooperative Research Centres (CRC). It examines how researchers reconcile the many demands of their dual role, first, as a government researcher or academic, and second as a committed participant in an industry-collaborative research centre. These collaborations go beyond ‘applied research’ to span fundamental research and immediately useful knowledge. But reward systems and performance measures for academic researchers are still founded largely on ‘discovery’, while those for government researchers are based upon ‘application’. The risk is that researchers will be deflected by the collaboration in ways that conflict with their institutional responsibilities. The paper reports work analysing the management strategies used by the CRCs and their public sector partners to ensure that their common goals are achieved while preserving their institutional interests and the expectations of their research staff. The aim is to identify effective ways of managing the various ‘risks’ of cross-sector collaborative research and development (R&D) in Australia and more widely.
    Type of Medium: Electronic Resource
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  • 5
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    Unknown
    Ann Arbor, Mich., etc., : Periodicals Archive Online (PAO)
    Journal of Asian Studies. 53:4 (1994:Nov.) 1319 
    ISSN: 0021-9118
    Topics: Political Science , Economics
    Description / Table of Contents: Southeast Asia
    Notes: Book Reviews
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 629-630 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The monoclinic modification of dipotassium dichromate, β-K2Cr2O7, has been synthesized in the K2Cr2O7–H2O system. The structure consists of K+ cations and Cr2O72− dimers. In contrast with triclinic α-K2Cr2O7 [Kuz'min, Ilyukhin, Kharitonov & Belov (1969). Krist. Tech. 4, 441–461], the Cr2O72− groups in β-K2Cr2O7 have twofold crystallographic symmetry and are parallel to each other.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 232 (1971), S. 350-350 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Because australopithecines were fully erect and bipedal3 it is possible to apply postcranial information derived from modern Homo sapiens to australopithecines; the mechanical relations which hold true for modern bipedal Homo sapiens will also apply therefore to bipedal australopithecines. 1 ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Physics and chemistry of minerals 23 (1996), S. 141-150 
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract A complete solid-solution series between cubic (Pm 3 m) KMgF3 and tetragonal (I4/mcm) KCuF3 was synthesized at 730–735 °C in an inert atmosphere. X-ray powder-diffraction at room temperature shows that the transition between the cubic and tetragonal perovskite structures in the series K (Mg1−xCux) F3 occurs at x ∼ 0.6. Rietveld structure-refinements were done for selected compositions. In the cubic phase, all parameters are linear with composition up to the transition point. At the transition point, there is a strong discontinuity in the cell volume; this is strongly anisotropic with expansion along the a axes and contraction along the c axis due to a pronounced axial elongation of the (Mg, Cu) F6 octahedron that increases with increasing Cu content. The phase transition is first-order, with a discontinuity of ≈2% in the symmetry-breaking strain at xC. It is proposed that the phase transition in K (Mg, Cu) F3 is due to the onset of the cooperative Jahn-Teller effect. Compositional relationships for lattice vibrations in this solid solution were established using thin-film infrared spectroscopy. A phase transition occurring above 60 mole % KCuF3 is indicated by the appearance of one of the two modes expected for the tetragonal phase; the weaker mode is not resolved below 80 mole % KCuF3. Modes common to both structures vary smoothly and continuously across the binary; however, frequencies do not depend linearly on composition, nor is mode-softening discernable. Two-mode behaviour is observed only for the bending motion of the cubic phase, because this peak alone has non-overlapping end-member components.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Physics and chemistry of minerals 17 (1990), S. 108-116 
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The tetrahedral-site order-disorder transformation in gallium albite (NaGaSi3O8) has been investigated using Rietveld structure refinement. Study of gallium-substituted albite (in contrast to pure albite [NaAlSi3O8]) is facilitated by a relatively rapid order-disorder transformation and the large difference in X-ray scattering efficiencies of gallium and silicon. High albite-structure NaGaSi3O8, grown in a Na2WO4 flux, was ordered by hydrothermal annealing below 820° C and dry annealing above 820° C, to avoid melting, using a load pressure of approximately 1 kbar. Equilibration of the order-disorder reaction has been verified by three independent reversals of ordering. The transformation between low gallium albite and high gallium albite occurs over the temperature range 890° C 970° C. The gallium content of the T 1o site increases continuously with decreasing temperature. The gallium contents of the T 1m and T 2m sites decrease smoothly with increasing ordering while the gallium content of the T 2o site decreases, then increases and then decreases again with decreasing temperature. Unit-cell parameters and the triclinic obliquity vary throughout the order-disorder transformation and undergo abrupt changes at 913±3° C and 937±3° C. These abrupt changes correlate with changes in the gallium content of the T 2o site, the X and Z ordering parameters and the configurational entropy. The order-disorder transformation in gallium-aluminum albite (NaGa0.5Al0.5Si3O8) occurs in the temperature range 765° C-850° C, at a temperature intermediate to the transformation in albite (50% order at about 680±20° C) and gallium albite.
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  • 10
    Publication Date: 2015-05-11
    Description: Coffinite, USiO4, is an important U(IV) mineral, but its thermodynamic properties are not well-constrained. In this work, two different coffinite samples were synthesized under hydrothermal conditions and purified from a mixture of products. The enthalpy of formation was obtained by high-temperature oxide melt solution calorimetry. Coffinite is energetically metastable with respect to a mixture of UO2 (uraninite) and SiO2 (quartz) by 25.6 ± 3.9 kJ/mol. Its standard enthalpy of formation from the elements at 25 °C is −1,970.0 ± 4.2 kJ/mol. Decomposition of the two samples was characterized by X-ray diffraction and by thermogravimetry and differential scanning calorimetry coupled with mass spectrometric analysis of evolved gases. Coffinite slowly decomposes to U3O8 and SiO2 starting around 450 °C in air and thus has poor thermal stability in the ambient environment. The energetic metastability explains why coffinite cannot be synthesized directly from uraninite and quartz but can be made by low-temperature precipitation in aqueous and hydrothermal environments. These thermochemical constraints are in accord with observations of the occurrence of coffinite in nature and are relevant to spent nuclear fuel corrosion.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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