LETTERS

Thilo Arlt, Thomas Armbruster, Peter Ulmer, and Tjerk Peters
MnSi₂O₅ with the titanite structure: A new high-pressure phase in the MnO-SiO₂ binary     657
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Yeongkyoo Kim and R. James Kirkpatrick
NMR T₁ relaxation study of ¹³³Cs and ²³Na adsorbed on illite     661
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ARTICLES

Bruce S. Hemingway, Steven R. Bohlen, W.B. Hankins, Edgar F. Westrum Jr., and Oleg L Kuskov
Heat capacity and thermodynamic properties for coesite and jadeite, reexamination of the quartz-coesite equilibrium boundary     409
Abstract
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Tiziana Boffa Ballaran, Michael A. Carpenter, M. Chiara Domeneghetti, and Vittorio Tazzoli
Structural mechanisms of solid solution and cation ordering in augite-jadeite pyroxenes: I. A macroscopic perspective     419
Abstract
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Deposit Items

Tiziana Boffa Ballaran, Michael A. Carpenter, M. Chiara Domeneghetti, Ekhard K.H. Salje, and Vittorio Tazzoli
Structural mechanisms of solid solution and cation ordering in augite-jadeite pyroxenes: II. A microscopic perspective     434
Abstract
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Lucy M. Flesch, Baosheng Li, and Robert C. Liebermann
Sound velocities of polycrystalline MgSiO₃ -orthopyroxene to 10 GPa at room temperature     444
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Igor I. Mazin, Yingwei Fei, Robert Downs, and Ronald Cohen
Possible polytypism in FeO at high pressures     451
Abstract
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Bernard W. Evans and Hexiong Yang
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature     458
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Deposit Items

Kenton D. Hammonds, Anne Bosenick, Martin T. Dove, and Volker Heine
Rigid unit modes in crystal structures with octahedrally coordinated atoms     476
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Michael J. Toplis
Energy barriers to viscous flow and the prediction of glass transition temperatures of molten silicates     480
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Claude Herzberg and Jianzhong Zhang
Melting experiments in the systems CaO-MgO-Al₂O₃-SiO₂ and MgO-SiO₂ at 3 to 15 GPa     491
Abstract
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Andreas Lüttge, Udo Neumann, and Antonio C. Lasaga
The influence of heating rate on the kinetics of mineral reactions: An experimental study and computer models     501
Abstract
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Alexandre Zotov, Alexandre Mukhamet-Galeev, and Jacques Schott
An experimental study of kaolinite and dickite relative stability at 150-300 °C and the thermodynamic properties of dickite     516
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Yves Fuchs, Martine Lagache, and Jorge Linares
Fe-tourmaline synthesis under different T and F_O2 conditions     525
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Jung Ho Ahn and Peter R. Buseck
Transmission electron microscopy of muscovite alteration of tourmaline     535
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Huifang Xu, Peter R. Buseck, and Gufeng Luo
HRTEM investigation of microstructures in a length-slow chalcedony     542
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Elke Meissner, Thomas G. Sharp, and Sumit Chakraborty
Quantitative measurement of short compositional profiles using analytical transmission electron microscopy     546
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Andrea L. Foster, Gordon E. Brown Jr., Tracy N. Tingle, and George A. Parks
Quantitative arsenic speciation in mine tailings using X-ray absorption spectroscopy     553
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Vera M.F. Hammer, Eugen Libowitzky, and George R. Rossman
Single-crystal IR spectroscopy of very strong hydrogen bonds in pectolite, NaCa₂[Si₃O₈(OH)], and serandite, NaMn₂[Si₃O₈(OH)]     569
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E. Passaglia, G. Artioli, and A. Gualtieri
Crystal chemistry of the zeolites erionite and offretite     577
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A. Gualtieri, G. Artioli, E. Passaglia, S. Bigi, A. Viani, and J.C. Hanson
Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite     590
Abstract
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H. Effenberger, G. Giester, W. Krause, and H.-J. Bernhardt
Tschörtnerite, a copper-bearing zeolite from the Bellberg volcano, Eifel, Germany     607
Abstract
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Michael E. Fleet
Sodium heptasilicate: A high-pressure silicate with six-membered rings of tetrahedra interconnected by SiO₆ octahedra: (Na₈Si[Si₆O₁₈])     618
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Deposit Items

Franz Bernhard, Franz Walter, Karl Ettinger, Josef Taucher, and Kurt Mereiter
Pretulite, ScPO ₄ a new scandium mineral from the Styrian and Lower Austrian lazulite occurrences, Austria     625
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V. Kahlenberg and H. Böhm
Crystal structure of hexagonal trinepheline--a new synthetic NaAlSiO₄ modification     631
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Edward S. Grew, James J. McGee, Martin G. Yates, Donald R. Peacor, Roland C. Rouse, Joep P.P. Huijsmans, Charles K. Shearer, Michael Wiedenbeck, Douglas E. Thost, and Shu-Chun Su
Boralsilite (Al ₁₆ B ₆ Si ₂ O ₃₇ ): A new mineral related to sillimanite from pegmatites in granulite-facies rocks     638
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NEW MINERAL NAMES    652

John L. Jambor, Jacek Puziewicz, and Andrew C. Roberts
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MEMORIAL

Graham Chinner
Memorial of Stuart Olof Agrell, 1913-1996   666
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ERRATUM    668
Ferri-clinoholmquistite, Li₂(Fe²⁺,Mg)₃Fe³⁺₂Si₈O₂₂(OH)₂, a new ^BLi clinoamphibole from the Pedriza Massif, Sierra de Guadarrama, Spanish Central System, by José M. Caballero, Angeles Monge, Angel La lglesia, and Fernando Tornos (v. 83. 167-171. 1998).
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