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Vol. 84, No. 3 An International Journal of Earth and Planetary Materials

March 1999
 
     
 

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 (Mg0.95,Fe0.05)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, Na2Mg4+xFe3+2-2xSi6+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(Ti1-xSix) 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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(Contents continued on outside back cover)


AMMIAY 84(3)213-464 ISSN 0003-004X

 
 

(Contents continued from front cover)

 
 
 

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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Deposit items

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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