ARTICLES

John Brodholt
Ab initio calculations on point defects in forsterite (Mg₂SiO₄) and implications for diffusion and creep    1049
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Tullio Pilati, Francesco Demartin, and Carlo Maria Gramaccioli
Lattice-dynamical evaluation of thermodynamic properties and atomic displacement parameters for beryl using a transferable empirical force field    1054
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Ralf Siewert and Matthias Rosenhauer
Viscoelastic relaxation measurements in the system SiO₂-NaAlSiO₄ by photon correlation spectroscopy    1063
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Takeshi Hoshi and Tokuhei Tagai
TEM investigation of potassium-calcium feldspar inclusions in Bøggild plagioclase    1073
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Ulrich Klein, Thomas G. Sharp, and John C. Schumacher
Analytical electron microscopy of nanometer-scale hornblende lamellae: Low-temperature exsolution in cummingtonite    1079
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Vidal Barrón, Natividad Gálvez, Michael F. Hochella, Jr., and José Torrent
Epitaxial overgrowth of goethite on hematite synthesized in phosphate media: A scanning force and transmission electron microscopy study    1091
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Weixin Xu, Donald R. Peacor, Wayne A. Dollase, Rob Van Der Voo, and Rick Beaubouef
Transformation of titanomagnetite to titanomaghemite; A slow, two-step oxidation-ordering process in MORB    1101
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Eugen Libowitzky and George R. Rossman
An IR absorption calibration for water in minerals    1111
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J. F. Stebbins, J. V. Oglesby, and Z. Xu
Disorder among network-modifier cations in silicate glasses: New constraints from triple-quantum ¹⁷O NMR    1116
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Hideki Maekawa, Satoshi Kato, Katsuyuki Kawamura, and Toshio Yokokawa
Cation mixing in natural MgAl₂O₄ spinel: A high-temperature ²⁷Al NMR study    1125
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Simon Kohn, C. Michael B. Henderson, and Ray Dupree
Si-Al ordering in leucite-group minerals and ion-exchanged analogues: An MAS NMR study    1133
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S. M. Haile and B. J. Wuensch
Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates    1141
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Alain Manceau, Victor A. Drits, Ewen Silvester, Céline Bartoli, and Bruno Lanson
Structural mechanism of CO²⁺ oxidation by the phyllomanganate buserite    1150
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Peter C. Burns
A new uranyl oxide hydrate sheet in vandendriesscheite: Implications for mineral paragenesis and the corrosion of spent nuclear fuel    1176
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P. A. Bland, S. P. Kelley, F. J. Berry, J. M. Cadogan, and C. T. Pillinger
Artificial weathering of the ordinary chondrite Allegan: Implications for the presence of Cl^- as a structural component in akaganéite   1187
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Robert W. Luth
Experimental study of the system phlogopite-diopside from 3.5 to 17 GPa    1198
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Genyong Peng, James F. Luhr, and James J. McGee
Factors controlling sulfur concentrations in volcanic apatite    1210
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C. K. Gessmann, B. Spiering, and M. Raith
Experimental study of the Fe-Mg exchange between garnet and biotite: Constraints on the mixing behavior and analysis of the cation-exchange mechanisms    1225
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Bjørn Jamtveit, Sven Dahlgren, and Haakon Austrheim
High-grade contact metamorphism of calcareous rocks from the Oslo Rift, Southern Norway    1241
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Joel Grice and George Y. Chao
Lukechangite-(Ce), a new rare-earth-fluorocarbonate mineral from Mont Saint-Hilaire, Quebec    1255
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NEW MINERAL NAMES    1261
John L. Jambor and Andrew C. Roberts
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AUTHOR INDEX    1265
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SUBJECT INDEX    1270
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