LETTERS

Jiuhua Chen, Rui Li, John B. Parise, and Donald J. Weidner
Pressure induced ordering in (Ni,Mg)₂SiO₄ olivine    1519
Full Text (324 K)

Simon C. Kohn
The solubility of H₂O in nominally anhydrous mantle minerals using ¹H MAS NMR    1523
Full Text (400 K)

Martin Kunz, Dimitrios Xirouchakis, Donald H. Lindsley, and Daniel Häusermann
High pressure phase transition in titanite (CaTiOSiO₄)    1527
Full Text (384 K)

Bjorn Mysen
Phosphorus speciation changes across the glass transition in polymerized alkali silicate glasses and melts    1531
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ARTICLES

Udo Becker, Michael F. Hochella Jr., and Edoardo Aprà
The electronic structure of hematite {001} surfaces: Applications to the interpretation of STM images and heterogeneous surface reactions    1301
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J.F. Stebbins
Magnesium site exchange in forsterite: A direct measurement by high-temperature ²⁵Mg NMR spectroscopy    1315
Full Text (440 K)

C. Closmann, E. Knittle, and F. Bridges
An XAFS study of the crystal chemistry of Fe in orthopyroxene    1321
Full Text (1 MB)

Stuart A. Hayward and Ekhard K.H. Salje
Displacive phase transition in anorthoclase: The "plateau effect" and the effect of T1-T2 ordering on the transition temperature    1332
Full Text (424 K)

Piera Benna, Mario Tribaudino, and Emiliano Bruno
The structure of ordered and disordered lead feldspar (PbAl₂Si₂O₈)    1337
Full Text (608 K)

Robert T. Downs, Aaron Andalman, and Marc Hudacsko
The coordination numbers of Na and K atoms in low albite and microcline as determined from a procrystal electron-density distribution    1344
Full Text (600 K)

Mark D. Welch, Paul F. Schofield, Gordon Cressey, and Chris J. Stanley
Cation ordering in lead-molybdenum-vanadium oxychlorides    1350
Full Text (872 K)

Huifang Xu and David R. Veblen
Superstructures and domain structures in natural and synthetic kalsilite    1360
Full Text (976 K)

Huifang Xu and Peter R. Buseck
TEM investigation of the domain structure and superstructure in hillebrandite, Ca₂SiO₃(OH)₂    1371
Full Text (264 K)

Ishmael Hassan
Direct observation of phase transitions in aluminate sodalite, Ca₈[Al₁₂O₂₄](CrO₄)₂    1375
Full Text (632 K)

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(Contents continued from front cover)

S.L. Cady, H.-R. Wenk, and K.H. Downing
HRTEM of microcrystalline opal in chert and porcelanite from the Monterey Formation, California    1380
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Huifang Xu, Yiqiang Zhang, and David R. Veblen
Periodic and nonperiodic interstratification in the chlorite-biotite series    1396
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Lubomír Smrcok and Lubomír Benco
Ab initio periodic Hartree-Fock study of lizardite 1T     1405
Full Text (556 K)

Tim Holland and Roger Powell
Thermodynamics of order-disorder in minerals: I. Symmetric formalism applied to minerals of fixed composition    1413
Full Text (968 K)

Tim Holland and Roger Powell
Thermodynamics of order-disorder in minerals: II. Symmetric formalism applied to solid solutions    1425
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Aurora Pun and James J. Papike
Unequilibrated eucrites and the equilibrated Juvinas eucrite: Pyroxene REE systematics and major, minor, and trace element zoning    1438
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C. Waters and A.E. Boudreau
A reevaluation of crystal-size distributions in chromite cumulates    1452
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Helen M. Lang
Pressure-temperature-reaction history of metapelitic rocks from the Maryland Piedmont on the basis of correlated garnet zoning and plagioclase-inclusion composition    1460
Full Text (1.6 MB)
Images (280 K)

Raymond Jonckheere and Peter Van den haute
Observations on the geometry of etched fission tracks in apatite: Implications for models of track revelation    1476
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Paola Bonazzi and Fiorenzo Mazzi
Bottinoite, Ni(H₂O)₆[Sb(OH)₆]₂: Crystal structure, twinning, and hydrogen-bond model    1494
Full Text (600 K)

Mizuhiko Akizuki, Yasuhiro Kudoh, and Takahiro Kuribayashi
Crystal structures of the {011}, {610}, and {010} growth sectors in brewsterite    1501
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Marcus Nowak, Harald Behrens, and Wilhelm Johannes
A new type of high-temperature, high-pressure cell for spectroscopic studies of hydrous silicate melts    1507
Full Text (568 K)

NEW MINERAL NAMES    1513

John L. Jambor, Edward S. Grew, and Andrew C. Roberts
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AUTHOR INDEX    1535

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SUBJECT INDEX    1543

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