PRESIDENTIAL ADDRESS

Bernard W. Evans, Mark S. Ghiorso
Thermodynamics and petrology of cummingtonite   649
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LETTERS

J. F. Stebbins, S. Sen, I. Farnan
Silicate species exchange, viscosity, and crystallization in a low-silica melt: In situ high-temperature MAS NMR spectroscopy   861
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I-Ming Chou, W. A. Bassett, T. B. Bai
Hydrothermal diamond-anvil cell study of melts: Eutectic melting of the assemblage Ca(OH)₂ + CaCO₃ with excess H₂O and lack of evidence for "portlandite II" phase   865
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George D. Guthrie, Jr., David L. Bish, Robert C. Reynolds, Jr.
Modeling the X-ray diffraction pattern of opal-CT   869
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ARTICLES

J. D. Fabris, J. M. D. Coey, Qinian Qi, W. N. Mussell
Characterization of Mg-rich maghemite from tuffite   664
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Youxue Zhang, Zhengjiu Xu
Atomic radii of noble gas elements in condensed phases   670
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Emil Makovicky
Structural parallels between the high-pressure B phases and the leucophoenicite series   676
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K. L. Bartelmehs, R. T. Downs, G. V. Gibbs, M. B. Boisens, Jr., J. B. Birch
Tetrahedral rigid-body motion in silicates   680
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Anne Bosenick, Charles A. Geiger, Torsten Schaller, Angelika Sebald
²⁹Si MAS NMR and IR spectroscopic investigation of synthetic pyrope-grossular garnet solid solutions   691
Full Text (2.1 MB)

Simon C. Kohn, C. Michael B. Henderson, Ray Dupree
Si-Al order in leucite revisited: New information from an analcite-derived analogue   705
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Hiroshi Takeda, Malcolm Ross
Mica polytypism: Identification and origin   715
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D. J. Yaughan, K. E. R. England, G. H. Kelsall, Q. Yin
Electrochemical oxidation of chalcopyrite (CuFeS₂) and the related metal-enriched derivatives Cu₄Fe₅S₈, Cu₉Fe₉S₁₆, and Cu₉Fe₈S₁₆   725
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Gregory R. Lumpkin, Rodney C. Ewing
Geochemical alteration of pyrochlore group minerals: Pyrochlore subgroup   732
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Deposit Item

Judy Baker, R. C. Newton
Experimentally determined activity-composition relations for Ca-rich scapolite in the system CaAl₂Si₂O₈-NaAISi₃O₈-CaCO₃ at 7 kbar   744
Full Text (1.2 MB)

Steven R. Bohlen, James O. Eckert, Jr., W. B. Hankins
Experimentally determined solidi in the Ca-bearing granite system NaAISi₃O₈-CaAl₂Si₂O₈-KAISi₃O₈ -SiO₂-H₂O-CO₂   752
Full Text (864 K)

John M. Eiler, John W. Valley, Colin M. Graham, Lukas P. Baumgartner
The oxygen isotope anatomy of a slowly cooled metamorphic rock   757
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(Contents continued on outside back cover)

(Contents continued from front cover)

Michael B. Wolf, David London
Incongruent dissolution of REE- and Sr-rich apatite in peraluminous granitic liquids: Differential apatite, monazite, and xenotime solubilities during anatexis   765
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Bradley S. Singer, Michael A. Dungan, Graham D. Layne
Textures and Sr, Ba, Mg, Fe, K, and Ti compositional profiles in volcanic plagioclase: Clues to the dynamics of calc-alkaline magma chambers   776
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Gregory A. Snyder, Lawrence A. Taylor, Eric A. Jerde, Robert N. Clayton, Toshiko K. Mayeda, Peter Deines, George R. Rossman, Nikolai V. Sobolev
Archean mantle heterogeneity and the origin of diamondiferous eclogites, Siberia: Evidence from stable isotopes and hydroxyl in garnet   799
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Jodie L. Hayob, Eric J. Essene
Armalcolite in crustal paragneiss xenoliths, central Mexico   810
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Ian M. Steele
Oscillatory zoning in meteoritic forsterite   823
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Hartwig E. Frimmel, Dennis Hoffmann, Ron T. Watkins, John M. Moore
An Fe analogue of kinoshitalite from the Broken Hill massive sulfide deposit in the Namaqualand Metamorphic Complex, South Africa   833
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Yongshan Dai, Jeffrey E. Post
Crystal structure of hillebrandite: A natural analogue of calcium silicate hydrate (CSH) phases in Portland cement   841
Full Text (848 K)

NEW MINERAL NAMES    845

John L. Jambor, Nikolai N. Pertsev, Andrew C. Roberts
Full Text (1 MB)

PRESENTATION OF AWARDS FOR 1994

Ho-Kwang Mao
Presentation of the Roebling Medal of the Mineralogical Society of America for 1994 to William A. Bassett   851
Full Text (160 K)

William A. Bassett
Acceptance of the Roebling Medal of the Mineralogical Society of America for 1994   852
Full Text (280 K)

Alexandra Navrotsky
Presentation of the Mineralogical Society of America Award for 1994 to Ronald E. Cohen   854
Full Text (176 K)

Ronald E. Cohen
Acceptance of the Mineralogical Society of America Award for 1994   855
Full Text (392 K)

Gordon E. Brown, Jr.
Presentation of the Distinguished Public Service Medal for 1994 to Konrad Bates Krauskopf   857
Full Text (444 K)

Konrad Bates Krauskopf
Acceptance of the Distinguished Public Service Medal for 1994   859
Full Text (444 K)