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
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Lars Stixrude, Ronald E. Cohen, Rici Yu, and Henry Krakauer
Prediction of phase transition in CaSiO₃ perovskite and implications for lower mantle structure    1293
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K.-U. Hess and D.B. Dingwell
Viscosities of hydrous leucogranitic melts: A non-Arrhenian model    1297
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REVIEW

Robert M. Hazen and Alexandra Navrotsky
Effects of pressure on order-disorder reactions    1021
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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
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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
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Eugen Libowitzky and George R. Rossman
FTIR spectroscopy of lawsonite between 82 and 325 K    1080
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Bruno Reynard and David C. Rubie
High-pressure, high-temperature Raman spectroscopic study of ilmenite-type MgSiO₃    1092
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George A. Lager and Robert B. Von Dreele
Neutron powder diffraction study of hydrogarnet to 9.0 Gpa    1097
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Michael E. Fleet
Sodium tetrasilicate: A complex high-pressure framework silicate (Na₆Si₃[Si₉O₂₇])    1105
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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
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Hexiong Yang and Bernard W. Evans
X-ray structure refinements of tremolite at 140 and 295 K: Crystal chemistry and petrologic implications    1117
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Huifang Xu, David R. Veblen, Gufeng Luo, and Jiyue Xue
Transmission electron microscopy study of the thermal decomposition of tremolite into clinopyroxene    1126
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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
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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
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(Contents continued from front cover)

C. Romano, J.E. Mungall, T. Sharp, and D.B. Dingwell
Tensile strengths of hydrous vesicular glasses: An experimental study    1148
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Frank Schulze, Harald Behrens, François Holtz, Jacques Roux, and Wilhelm Johannes
The influence of H₂O on the viscosity of a haplogranitic melt    1155
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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
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George B. Morgan VI and David London
Optimizing the electron microprobe analysis of hydrous alkali aluminosilicate glasses    1176
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Marcel Kamperman, Leonid V. Danyushevsky, Wayne R. Taylor, and Wieslav Jablonski
Direct oxygen measurements of Cr-rich spinel: Implications for spinel stoichiometry    1186
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Craig S. Schwandt, James J. Papike, and Charles K. Shearer
Trace element zoning in pelitic garnet of the Black Hills, South Dakota    1195
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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
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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
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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
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Gregory R. Lumpkin and Rodney C. Ewing
Geochemical alteration of pyrochlore group minerals: Betafite subgroup    1237
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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
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Janusz Janeczek and Rodney C. Ewing
Florencite-(La) with fissiogenic REEs from a natural fission reactor at Bangombé, Gabon    1263
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Joël Brugger and Peter Berlepsch
Description and crystal structure of fianelite, Mn₂V(V,As)O₇·2H₂O, a new mineral from Fianel, Val Ferrera, Graubünden, Switzerland    1270
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Stefano Merlino, Marco Pasero, Natale Perchiazzi, and Anthony R. Kampf
Laurelite: Its crystal structure and relationship to α-PbF₂    1277
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NEW MINERAL NAMES    1282

John L. Jambor, Vladimir A. Kovalenker, Jacek Puziewicz, and Andrew C. Roberts
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BOOK REVIEWS    1287

Dana T. Griffen
PHYSICS AND CHEMISTRY OF EARTH MATERIALS. By Alexandra Navrotsky. Cambridge University Press, 1994. xiv + 417 pages.
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David Virgo
APPLIED MOSSBAUER SPECTROSCOPY: THEORY AND PRACTICE FOR GEOCHEMISTS AND ARCHAEOLOGISTS. PHYSICS AND CHEMISTRY OF THE EARTH, volume 18 Parts III-VI. Edited by S. Mitra. Pergamon Press 1992. xiv + 381 pages.
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