PRESIDENTIAL ADDRESS

J.J. Papike
Pyroxene as a recorder of cumulate formational processes in asteroids, Moon, Mars, Earth: Reading the record with the ion microprobe    525
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LETTERS

Frank C. Hawthorne, Giancarlo Della Ventura, and Jean-Louis Robert
Short-range order of (Na,K) and Al in tremolite: An infrared study    782
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Anatoly B. Belonoshko, Leonid S. Dubrovinsky, and Natalya A. Dubrovinsky
A new high-pressure silica phase obtained by molecular dynamics    785
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ARTICLES

Björn Winkler, Peter Blaha, and Karlheinz Schwarz
Ab initio calculation of electric-field--gradient tensors of forsterite   545
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Simon J. Kitchin, Simon C. Kohn, Ray Dupree, C. Michael B. Henderson, and Kuniaki Kihara
In situ ²⁹Si MAS NMR studies of structural phase transitions of tridymite    550
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Michael A. Carpenter and Daniela Cellai
Microstructures and high-temperature phase transitions in kalsilite    561
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Bruno Reynard, Fouzia Takir, François Guyot, Gabriel D. Gwanmesia, Robert C. Liebermann, and Philippe Gillet
High-temperature Raman spectroscopic and X-ray diffraction study of β-Mg₂SiO₄: Insights into its high-temperature thermodynamic properties and the β to α phase-transformation mechanism and kinetics    585
Full Text (896 K)

Lee A. Groat, Stefan Kek, Ulrich Bismayer, Claudia Schmidt, Hans Georg Krane, Hinrich Meyer, Leona Nistor, and Gustaaf Van Tendeloo
A synchrotron radiation, HRTEM, X-ray powder diffraction, and Raman spectroscopic study of malayaite, CaSnSiO₅    595
Full Text (592 K)

G. Artioli, A. Pavese, M. Bellotto, S.P. Collins, and G. Lucchetti
Mn crystal chemistry in pumpellyite: A resonant scattering powder diffraction Rietveld study using synchrotron radiation    603
Full Text (720 K)

Isabelle Martinez, Jianzhong Zhang, and Richard J. Reeder
In situ X-ray diffraction of aragonite and dolomite at high pressure and high temperature: Evidence for dolomite breakdown to aragonite and magnesite    611
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Thomas Armbruster, Ping Yang, and Bernard W. Liebich
Mechanism of the SiO₄ for CO₃ substitution in defernite, Ca₆(CO₃)_1.58(Si₂O₇)_0.21(OH)₇
[Cl_0.50(OH)_0.08(H₂O)_0.42]: A single-crystal X-ray study at 100 K    625
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(Contents continued from front cover)

George E. Harlow
Structure refinement of a natural K-rich diopside: The effect of K on the average structure    632
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Rex A. Couture and Robert F. Dymek
A reexamination of absorption and enhancement effects in X-ray fluorescence trace element analysis    639
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Philippe Gillet, Jean-Marie Malézieux, and Jean-Paul Itiè
Phase changes and amorphization of zeolites at high pressures: The case of scolecite and mesolite    651
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Irina Kiseleva, Alexandra Navrotsky, Igor A. Belitsky, and Boris A. Fursenko
Thermochemistry and phase equilibria in calcium zeolites    658
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Irina Kiseleva, Alexandra Navrotsky, Igor A. Belitsky, and Boris A. Fursenko
Thermochemistry of natural potassium sodium calcium leonhardite and its cation-exchanged forms    668
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Judy Baker and T.J.B. Holland
Experimental reversals of chlorite compositions in divariant MgO + Al₂O₃ + SiO₂ + H₂O assemblages    676
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J. Longhi and C.M. Bertka
Graphical analysis of pigeonite-augite liquidus equilibria    685
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Donna L. Whitney, Trudy A. Mechum, Yildirim Dilek, and Scott M. Kuehner
Modification of garnet by fluid infiltration during regional metamorphism in garnet through sillimanite-zone rocks, Dutchess County, New York    696
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Liping Wang, Youxue Zhang, and Eric J. Essene
Diffusion of the hydrous component in pyrope    706
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Jonathan Icenhower and David London
Experimental partitioning of Rb, Cs, Sr, and Ba between alkali feldspar and peraluminous melt    719
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Paola Bonazzi, Silvio Menchetti, and Thomas Reinecke
Solid solution between piemontite and androsite-(La), a new mineral of the epidote group from Andros Island, Greece    735
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Edward S. Grew, Donald R. Peacor, Roland C. Rouse, Martin G. Yates, Shu-Chun Su, and Nicholas Marquez
Hyttsjöite, a new, complex layered plumbosilicate with unique tetrahedral sheets from Långban, Sweden    743
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Oded Navon, F.A. Frey, and E. Takazawa
Magma transport and metasomatism in the mantle: A critical review of current geochemical models---Discussion    754
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Jane E. Nielson and Howard G. Wilshire
Magma transport and metasomatism in the mantle: A critical review of current geochemical models---Reply to Navon et al.    760
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NEW MINERAL NAMES    766

John L. Jambor, Nikolai N. Pertsev, and Andrew C. Roberts
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PRESENTATION OF AWARDS FOR 1995

Bernard W. Evans
Presentation of the Roebling Medal of the Mineralogical Society of America for 1995 to William S. Fyfe    771
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William S. Fyfe
Acceptance of the Roebling Medal of the Mineralogical Society of America for 1995    773
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Eric J. Essene and James R. O'Neil
Presentation of the Mineralogical Society of America Award for 1995 to Zachary D. Sharp    775
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Zachary D. Sharp
Acceptance of the Mineralogical Society of America Award for 1995    777
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MEMORIAL

Larry A. Haskin
Memorial of Carl Tolman, 1897-1995    779
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BOOK REVIEW

Eric J. Essene
Glossary of Mineral Species by M. Fleischer and J.A. Mandarino, 1995    781
Full Text (88 K)