ARTICLES

Philippe Courtial and Donald Bruce Dingwell
Densities of melts in the CaO-MgO-Al₂O₃-SiO₂ system    465
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Paolo Papale
Modeling of the solubility of a two-component H₂O + CO₂ fluid in silicate liquids   477
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Dorothee J.M. Burkhard, Gene C. Ulmer, Günther Redhammer, and George H. Myer
Dynamic electrochemical assessment of redox reactions in natural micas between 613 and 1373 K at 10⁵ Pa     493
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Dominique de Ligny and Alexandra Navrotsky
Energetics of kaolin polymorphs   506
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Dawn E. Janney and Hans-Rudolf Wenk
Peristerite exsolution in metamorphic plagioclase from the Lepontine Alps: An analytical and transmission electron microscope study   517
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Hengzhong Zhang and Jillian F. Banfield
New kinetic model for the nanocrystalline anatase-to-rutile transformation revealing rate dependence on number of particles   528
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Edward S. Grew, Günther J. Redhammer, Georg Amthauer, Mark A. Cooper, Frank C. Hawthorne, and Karl Schmetzer
Iron in kornerupine: A ⁵⁷Fe Mössbauer spectroscopic study and comparison with single-crystal structure refinement    536
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Brigitte Wopenka, John J. Freeman, and Edward Grew
Raman spectroscopic identification of B-free and B-rich kornerupine (prismatine)   550
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Richard J. Harrison, Martin T. Dove, Kevin S. Knight, and Andrew Putnis
In situ neutron diffraction study of non-convergent cation ordering in the (Fe₃O₄)_1-x(MgAl₂O₄)_x spinel solid solution   555
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Ru Y. Zhang, Jin F. Shu, Ho K. Mao, and Juhn G. Liou
Magnetite lamellae in olivine and clinohumite from Dabie UHP ultramafic rocks, central China   564
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Matthew J. Kohn
Why most "dry" rocks should cool "wet"   570
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Jeffrey H. Tepper and Scott M. Kuehner
Complex zoning in apatite from the Idaho batholith: A record of magma mixing and intracrystalline trace element diffusion   581
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J. Najorka, M. Gottschalk, G. Franz, and W. Heinrich
Ca-Sr distribution between amphibole, clinopyroxene, and chloride-bearing solutions   596
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D. Robinson and A. Santana de Zamora
The smectite to chlorite transition in the Chipilapa geothermal system, El Salvador   607
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Susan H. Sutheimer, Patricia A. Maurice, and Qunhui Zhou
Dissolution of well and poorly crystallized kaolinites: Al speciation and effects of surface characteristics   620
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Giuseppe G. Biino, Norman Mannella, Alexander Kay, Bongjin Mun, and Charles S. Fadley
Surface chemical characterization and surface diffraction effects of real margarite (001): An angle-resolved XPS investigation   629
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H. Wayne Nesbitt and M. Reinke
Properties of As and S at NiAs, NiS, and Fe_1-xS surfaces, and reactivity of niccolite in air and water   639
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Fanrong Chen, Rodney C. Ewing, and Sue B. Clark
The Gibbs free energies and enthalpies of formation of U⁶⁺ phases: An empirical method of prediction   650
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Michael Schindler and Frank C. Hawthorne
Schubnelite, [Fe³⁺(V⁵⁺O₄)(H₂O)], a novel heteropolyhedral framework mineral   665
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Herta Effenberger, Werner H. Paar, Dan Topa, Franz J. Culetto, and Gerald Giester
Toward the crystal structure of nagyagite, [Pb(Pb,Sb)S₂] [(Au,Te)]   669
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Deposit items

LETTERS

Jennifer M. Jackson, Stanislav V. Sinogeikin, and Jay D. Bass
Elasticity of MgSiO₃ orthoenstatite   677
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Hexiong Yang, Jürgen Konzett, Charles T. Prewitt, and Yingwei Fei
Single-crystal structure refinement of synthetic ^M4K-substituted potassic richterite K(KCa)Mg₅Si₈O₂₂(OH)₂   681
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NEW MINERAL NAMES     685

John L. Jambor, Jacek Puziewicz and Andrew C. Roberts
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BOOK REVIEWS    689

Stephen P. Altaner
X-Ray Diffraction and the Identication and Analysis of Clay Minerals, 2nd Edition. By D. M. Moore and R. C. Reynolds Jr. Oxford, New York, 1997, 378 p.
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James W. Downs
X-Ray Charge Densities and Chemical Bonding. By P. Coppens, Oxford University Press, 1997, 358 p.
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SPECIAL NOTICE: WEB PAPER

Ernest H. Nickel and Joel D. Grice
The IMA Commission on New Minerals and Mineral Names: Procedures and guidelines on mineral nomenclature, 1998   691
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ERRATA   692

M. Darby Dyar, Marjorie E. Taylor, Timothy M. Lutz, Carl A. Francis, Charles V. Guidotti, and Michael Wise
Intrusive chemical characterization of tourmaline: Mössbauer study of Fe valance and site occupancy. (Am. Mineral., 83, 848-864, 1998)
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Gregor Markl and Sandra Piazolo
Stability of high-Al titanite from low-pressure calcsilicates in light of fluid and host-rock composition. (Am. Mineral., 84, 37-47, 1999)
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