American

Mineralogist

1996, Volume 81 September-October

AMERICAN MINERALOGIST, Volume 81, N9-10 1996

LETTERS

     Markus Rauch, Hans Keppler, Wolfgang Häfner, Brent Poe, and Alexander
     Wokaun
     A pressure-induced phase transition in MgSiO3-rich garnet revealed by
     Raman spectroscopy                                     1289

     Lars Stixrude, Ronald E. Cohen, Rici Yu, and Henry Krakauer
     Prediction of phase transition in CaSiO3 perovskite and implications
     for lower mantle structure                             1293

     K.-U. Hess and D.B. Dingwell
     Viscosities of hydrous leucogranitic melts: 
     A non-Arrhenian model                                  1297

REVIEW

     Robert M. Hazen and Alexandra Navrotsky
     Effects of pressure on order-disorder reactions        1021

ARTICLES

     Carrick M. Eggleston, Jean-Jacques Ehrhardt, and Werner Stumm
     Surface structural controls on pyrite oxidation kinetics: An XPS-UPS,
     STM, and modeling study                                1036

     Kenton D. Hammonds, Martin T. Dove, Andrew P. Giddy, Volker Heine, and
     Björn Winkler
     Rigid-unit phonon modes and structural phase transitions in framework
     silicates                                              1057

     Eugen Libowitzky and George R. Rossman
     FTIR spectroscopy of lawsonite between 82 and 325 K    1080

     Bruno Reynard and David C. Rubie
     High-pressure, high-temperature Raman spectroscopic study of
     ilmenite-type MgSiO3 1092

     George A. Lager and Robert B. Von Dreele
     Neutron powder diffraction study of hydrogarnet to 9.0 Gpa 1097

     Michael E. Fleet
     Sodium tetrasilicate: A complex high-pressure framework silicate
     (Na6Si3[Si9O27])                                       1105

     M. Gregorkiewitz, B. Lebech, M. Mellini, and C. Viti
     Hydrogen positions and thermal expansion in lizardite-1T from Elba: A
     low-temperature study using Rietveld refinement of neutron diffraction
     data                                                   1111

     Hexiong Yang and Bernard W. Evans
     X-ray structure refinements of tremolite at 140 and 295 K: Crystal
     chemistry and petrologic implications                  1117

     Huifang Xu, David R. Veblen, Gufeng Luo, and Jiyue Xue
     Transmission electron microscopy study of the thermal decomposition of
     tremolite into clinopyroxene                           1126

     Sang-Heon Shim, Soo Jin Kim, and Jung Ho Ahn
     Quantitative analysis of alkali feldspar minerals using Rietveld
     refinement of X-ray diffraction data                   1133

     L. Chai and A. Navrotsky
     Synthesis, characterization, and energetics of solid solution along
     the dolomite-ankerite join, and implications for the stability of
     ordered CaFe(CO3)2                                     1141

     C. Romano, J.E. Mungall, T. Sharp, and D.B. Dingwell
     Tensile strengths of hydrous vesicular glasses: An experimental study
                                                            1148

     Frank Schulze, Harald Behrens, François Holtz, Jacques Roux, and
     Wilhelm Johannes
     The influence of H2O on the viscosity of a haplogranitic melt 1155

     I.S. McCallum and Hugh E. O'Brien
     Stratigraphy of the lunar highland crust: Depths of burial of lunar
     samples from cooling-rate studies                      1166

     George B. Morgan VI and David London
     Optimizing the electron microprobe analysis of hydrous alkali
     aluminosilicate glasses                                1176

     Marcel Kamperman, Leonid V. Danyushevsky, Wayne R. Taylor, and Wieslav
     Jablonski
     Direct oxygen measurements of Cr-rich spinel: Implications for spinel
     stoichiometry                                          1186

     Craig S. Schwandt, James J. Papike, and Charles K. Shearer
     Trace element zoning in pelitic garnet of the Black Hills, South
     Dakota                                                 1195

     Jibamitra Ganguly, Sumit Chakraborty, Thomas G. Sharp, and Douglas
     Rumble III
     Constraint on the time scale of biotite-grade metamorphism during
     Acadian orogeny from a natural garnet-garnet diffusion couple 1208

     J.G. Liou and R.Y. Zhang
     Occurrences of intergranular coesite in ultrahigh-P rocks from the
     Sulu region, eastern China: Implications for lack of fluid during
     exhumation                                             1217

     Ruedi Sperlich, Reto Gieré, and Martin Frey
     Evolution of compositional polarity and zoning in tourmaline during
     prograde metamorphism of sedimentary rocks in the Swiss Central Alps
                                                            1222

     Gregory R. Lumpkin and Rodney C. Ewing
     Geochemical alteration of pyrochlore group minerals: Betafite subgroup
                                                            1237

     Benjamin Hanson, John W. Delano, and David J. Lindstrom
     High-precision analysis of hydrous rhyolitic glass inclusions in
     quartz phenocrysts using the electron microprobe and INAA 1249

     Janusz Janeczek and Rodney C. Ewing
     Florencite-(La) with fissiogenic REEs from a natural fission reactor
     at Bangombé, Gabon                                     1263

     Joël Brugger and Peter Berlepsch
     Description and crystal structure of fianelite, Mn2V(V,As)O7.2H2O, a
     new mineral from Fianel, Val Ferrera, Graub¸nden, Switzerland 1270

     Stefano Merlino, Marco Pasero, Natale Perchiazzi, and Anthony R. Kampf
     Laurelite: Its crystal structure and relationship to alpha PbF2 1277

NEW MINERAL NAMES 1282

BOOK REVIEWS 1287