American Mineralogist, 1999, V 84, N 3, March.

PREFACE

Robert M. Hazen and John M. Parise
Dedication to Charles T. Prewitt, 
213


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

Orson L. Anderson and Juichiro Hama
Shifts in thermal expansivity with Fe content for solid solutions of
MgSiO3-FeSiO3 with the Perovskite structure 
221

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

A. Chopelas
Estimates of mantle relevant Clapeyron slopes in the MgSiO3 system from
high-pressure spectroscopic data 
233

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

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

Yingwei Fei
Effects of temperature and composition on the bulk modulus of (Mg,Fe)O 
272

Nancy L. Ross and Ross J. Angel
Compression of CaTiO3 and CaGeO3 perovskites 
277

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

Boris Kiefer, Lars Stixrude, and Renata Wentzcovitch
Normal and inverse ringwoodite at high pressures 
288

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

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

Victor L. Vinogard and Andrew Putnis
The description of Al, Si ordering in aluminosilicates using the cluster
variation method 
311

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

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

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

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

Kazuaki Okamoto and Shigenori Maruyama
The high-pressure synthesis of lawsonite in the MORB+H2O system 
362

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

Ganglin Chen, Joseph A. Cooke Jr., Gabriel D. Gwanmesia, and Robert C.
Liebermann
Elastic wave velocities of Mg3Al2Si3O12-pyrope garnet to 10 Gpa 
384

Mirko Schoenitz and Alexandra Navrotsky
Enthalpy of formation of katoite Ca3Al2[(OH)4]3: Energetics of the
hydrogarnet substitution 
389

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

Emil Makovicky and Tonci Balic-Zunic
Gillulyite Tl2(As,Sb)8S13: Reinterpretation of the crystal structure and
order-disorder phenomena 
400

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

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

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

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 pressures up to 68 GPa, 
447

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