American Mineralogist, 2005, V 90, N 4, April.


     
LETTERS

745 Growth zoning and strain patterns inside diamond crystals as revealed by Raman maps Lutz Nasdala, Wolfgang Hofmeister, Jeffrey W. Harris, and Jurgen Glinnemann 749 Differentiation of commercial vermiculite based on statistical analysis of bulk chemical data: Fingerprinting vermiculite from Libby, Montana U.S.A. Mickey E. Gunter, Eron Singleton, Bryan R. Bandli, Heather A. Lowers, and Gregory P. Meeker 755 Crystal structure of single-crystal CaGeO3 tetragonal garnet synthesized at 3 GPa and 1000 °C Akihiko Nakatsuka, Hiroki Chaya, and Akira Yoshiasa 758 Iron isotope exchange kinetics at the nanoparticulate ferrihydrite surface Rebecca L. Poulson, Clark M. Johnson, and Brian L. Beard 764 Cation distribution in MgFe2O4 vs. pressure and temperature: Experiments in a "piston-cylinder" apparatus Alexander I. Turkin and Valeri A. Drebushchak
MONAZITE GEOCHRONOLOGY

525 Preface to collected papers on monazite microprobe geochronology Michael L. Williams and Robert J. Tracy 526 Analytical perils (and progress) in electron microprobe trace element analysis applied to geochronology: Background acquisition, interferences, and beam irradiation effects Michael J. Jercinovic and Michael L. Williams 547 Contributions to precision and accuracy of monazite microprobe ages Joseph M. Pyle, Frank S. Spear, David A. Wark, Christopher G. Daniel, and Lara C. Storm 578 Electron-microprobe age mapping of monazite Philippe Goncalves, Michael L. Williams, and Michael J. Jercinovic 586 Isotopic age constraints from electron microprobe U-Th-Pb dates, using a three-dimensional concordia diagram Yvette D. Kuiper 592 Monazite ages in the Chesham Pond Nappe, SW New Hampshire, U.S.A.: Implications for assembly of central New England thrust sheets Joseph M. Pyle, Frank S. Spear, John T. Cheney, and Graham Layne 607 Electron-microprobe dating as a tool for determining the closure of Th-U-Pb systems in migmatitic monazites Alain Cocherie, Eug¦ne be Mezeme, Olivier Legendre, C. Mark Fanning, Michel Faure, and Philippe Rossi 619 Comparative isotopic and chemical geochronometry of monazite, with implications for U-Th-Pb dating by electron microprobe: An example from metamorphic rocks of the eastern Wyoming craton (U.S.A.) Peter S. Dahl, Michael A. Hamilton, Michael J. Jercinovic, Michael P. Terry, Michael L. Williams, and Robert Frei
ARTICLES

639 Re-examination of the hydrogarnet structure at high pressure using neutron powder diffraction and infrared spectroscopy George A. Lager, William G. Marshall, Zhenxian Liu, and Robert T. Downs 645 Anomalous elastic behavior and high-pressure structural evolution of zeolite levyne Giacomo Diego Gatta, Paola Comodi, Pier Francesco Zanazzi, and Tiziana Boffa Ballaran 653 Crystal chemistry of the hydrothermally synthesized Na2(Mn1-xFe2+x)2Fe3+(PO4)3 alluaudite-type solid solution Frederic Hatert, Leila Rebbouh, Raphael P. Hermann, Andre-Mathieu Fransolet, Gary J. Long, and Fernande Grandjean 663 Thermodynamic properties of uvarovite garnet (Ca3Cr2Si3O12) S. Klemme, J.C. van Miltenburg, P. Javorsky, and F. Wastin 667 Post-aragonite phase transformation in CaCO3 at 40 GPa Shigeaki Ono, Takumi Kikegawa, Yasuo Ohishi, and Jun Tsuchiya 672 Direct formation of the ?-CaSO4 phase in dehydration process of gypsum: In situ FTIR study P.S.R. Prasad, V. Krishna Chaitanya, K. Shiva Prasad, and D. Narayana Rao 679 The order-disorder character of FeOHSO4 obtained from the thermal decomposition of metahohmannite, Fe3+2(H2O)4[O(SO4)2] Gennaro Ventruti, Fernando Scordari, Emanuela Schingaro, Alessandro F. Gualtieri, and Carlo Meneghini 687 Temperature and composition dependence of structural phase transitions in Ca(TixZr1-x)OGeO4 Rikke Ellemann-Olesen and Thomas Malcherek 695 Low-T neutron powder-diffraction and synchrotron-radiation IR study of synthetic amphibole Na(NaMg)Mg5Si8O22(OH)2 G. Iezzi, G.D. Gatta, W. Kockelmann, G. Della Ventura, R. Rinaldi, W. Schafer, M. Piccinini, and F. Gaillard 701 Charge contrast imaging of fine-scale microstructure and compositional variation in garnet using the environmental scanning electron microscope Simon J. Cuthbert and James O. Buckman 708 Piston-cylinder experiments on H2O undersaturated Fe-bearing systems: An experimental setup approaching ?O2 conditions of natural calc-alkaline magmas Ralf Kagi, Othmar Muntener, Peter Ulmer, and Luisa Ottolini 718 Environmentally important, poorly crystalline Fe/Mn hydrous oxides: Ferrihydrite and a possibly new vernadite-like mineral from the Clark Fork River Superfund Complex Michael F. Hochella, Jr., Takeshi Kasama, Andrew Putnis, Christine V. Putnis, and Johnnie N. Moore 725 The true structure of wonesite, an interlayerdeficient trioctahedral sodium mica Toshihiro Kogure, Ritsuro Miyawaki, and Yasuyuki Banno 732 Clinoholmquistite discredited: The new amphibole end-member fluoro-sodic-pedrizite Roberta Oberti, Fernando Camara, and Luisa Ottolini 737 XRMapAnal: A program for analysis of quantitative X-ray maps Douglas K. Tinkham and Edward D. Ghent 768 NEW MINERAL NAMES Paula C. Piilonen, T. Scott Ercit, And Andrew C. Roberts 774 BOOK REVIEW DEER, HOWIE AND ZUSSMAN ROCK-FORMING MINERALS, SHEET SILICATES: MICAS, volume 3A, 2nd edition. By M.E. Fleet, The Geological Society, London, 2003, 758 pp. Stephen Guggenheim 776 ERRATUM The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fraction- ation behavior of Mn in Fe, Mg-orthopyroxene by Marilena Stimpfl (2005, vol. 90, p. 155-161,