Dedication to Charles T. Prewitt    213
Abstract

ARTICLES

A.P. Jephcoat, J.A. Hriljac, C.A. McCammon, H.St.C. O'Neill, D.C. Rubie, and L.W. Finger
High-resolution synchrotron X-ray powder diffraction and Rietveld structure refinement of two (Mg_0.95,Fe_0.05)SiO₃ perovskite samples synthesized under different oxygen fugacity conditions   214
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Orson L. Anderson and Juichiro Hama
Shifts in thermal expansivity with Fe content for solid solutions of MgSiO₃-FeSiO₃ with the perovskite structure   221
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Surendra K. Saxena, Leonid S. Dubrovinsky, Faramarz Tutti, and Tristan Le Bihan
Equation of state of MgSiO3 with the perovskite structure based on experimental measurements   226
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A. Chopelas
Estimates of mantle relevant Clapeyron slopes in the MgSiO₃ system from high-pressure spectroscopic data   233
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Hexiong Yang, Larry W. Finger, Pamela G. Conrad, Charles T. Prewitt, and Robert M. Hazen
A new pyroxene structure observed at high pressure: Single-crystal X-ray and Raman study of Pbcn-P2₁cn phase transition in protopyroxene   245
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Tibor Gasparik, John B. Parise, Richard J. Reeder, Victor G. Young, and Wendy S. Wilford
Composition, stability, and structure of a new member of the aenigmatite group, Na₂Mg_4+xFe³⁺_2-2xSi_6+xO₂₀, synthesized at 13–14 GPa   257
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Naotaka Tomioka and Kiyoshi Fujino
Akimotoite, (Mg,Fe)SiO₃, a new silicate mineral of the ilmenite group in the Tenham chondrite   267
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Yingwei Fei
Effects of temperature and composition on the bulk modulus of (Mg,Fe)O   272
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Nancy L. Ross and Ross J. Angel
Compression of CaTiO₃ and CaGeO₃ perovskites   277
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Ross J. Angel, Martin Kunz, Ronald Miletich, Alan B. Woodland, Mario Koch, and Ruth L. Knoche
Effect of isovalent Si, Ti substitution on the bulk moduli of Ca(Ti_1-xSi_x) SiO₅ titanites   282
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Boris Kiefer, Lars Stixrude, and Renata Wentzcovitch
Normal and inverse ringwoodite at high pressures   288
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Takeshi Toyoda, Satoshi Sasaki, and Masahiko Tanaka
Evidence of the charge ordering between Fe²⁺ and Fe³⁺ in magnetite observed by synchrotron X-ray anomalous scattering   294
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Simon A.T. Redfern, Richard J. Harrison, Hugh St.C. O'Neill, and David R.R. Wood
Thermodynamics and kinetics of cation ordering in MgAl₂O₄ spinel up to 1600 °C from in situ neutron diffraction   299
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Victor L. Vinogard and Andrew Putnis
The description of Al, Si ordering in aluminosilicates using the cluster variation method   311
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Paola Comodi, Pier Francesco Zanazzi, Zdenek Weiss, Milan Rieder, and Milan Drábek
"Cs-tetra-ferri-annite:" High-pressure and high-temperature behavior of a potential nuclear waste disposal phase   325
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R.T. Downs, H. Yang, R.M. Hazen, L.W. Finger, and C.T. Prewitt
Compressibility mechanisms of alkali feldspars: New data from reedmergnerite   333
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Satoru Urakawa, Naoki Igawa, Osamu Shimomura, and Hideo Ohno
High-pressure X-ray diffraction study on the structure of NaCl melt using synchrotron radiation   341
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Julia G. Bryce, Frank J. Spera, and Daniel J. Stein
Pressure dependence of self-diffusion in the NaAlO₂-SiO₂ system: Compositional effects and mechanisms   345
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Wuyi Wang and Eiichi Takahashi
Subsolidus and melting experiments of a K-rich basaltic composition to 27 GPa: Implication for the behavior of potassium in the mantle   357
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Kazuaki Okamoto and Shigenori Maruyama
The high-pressure synthesis of lawsonite in the MORB+H₂O system   362
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Pamela G. Conrad, Chang-Sheng Zha, Ho-kwang Mao, and Russell J. Hemley
The high-pressure, single-crystal elasticity of pyrope, grossular, and andradite   374
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Ganglin Chen, Joseph A. Cooke Jr., Gabriel D. Gwanmesia, and Robert C. Liebermann
Elastic wave velocities of Mg₃Al₂Si₃O₁₂-pyrope garnet to 10 Gpa   384
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Mirko Schoenitz and Alexandra Navrotsky
Enthalpy of formation of katoite Ca₃Al₂[(OH)₄]₃: Energetics of the hydrogarnet substitution   389
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J.J. Papike, G.W. Fowler, C.T. Adcock, and C.K. Shearer
Systematics of Ni and Co in olivine from planetary melt systems: Lunar mare basalts   392
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Emil Makovicky and Tonci Balic-Zunic
Gillulyite Tl₂(As,Sb)₈S₁₃: Reinterpretation of the crystal structure and order-disorder phenomena   400
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R.H. Parkman, J.M. Charnock, N.D. Bryan, F.R. Livens, and D.J. Vaughan
Reactions of copper and cadmium ions in aqueous solution with goethite, lepidocrocite, mackinawite, and pyrite   407
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Guillaume Morin, John D. Ostergren, Farid Juillot, Philippe Ildefonse, Georges Calas, and Gordon E. Brown Jr.
XAFS determination of the chemical form of lead in smelter-contaminated soils and mine tailings: Importance of adsorption processes   420
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G.V. Gibbs, O. Tamada, M.B. Boisen Jr., and F.C. Hill
Laplacian and bond critical point properties of the electron density distributions of sulfide bonds: A comparison with oxide bonds   435
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L. Zhang, J. Stanek, S.S. Hafner, H. Ahsbahs, H. Grünsteudel, J. Metge, and R. Rueffer
⁵⁷Fe nuclear forward scattering of synchrotron radiation in hedenbergite CaFeSi₂O₆ at hydrostatic pressures up to 68 GPa   447
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A.M. Hofmeister, H. Cynn, P.C. Burnley, and C. Meade
Vibrational spectra of dense, hydrous magnesium silicates at high pressure: Importance of the hydrogen bond angle   454
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