ARTICLES

M.J. Holdaway
Application of new experimental and garnet Margules data to the garnet-biotite geothermometer   881
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Charles A. Geiger
Volumes of mixing in aluminosilicate garnets: Solid solution and strain behavior    893
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Yuanming Pan and M.R. Stauffer
Cerium anomaly and Th/U fractionation in the 1.85 Ga Flin Flon Paleosol: Clues from REE- and U-rich accessory minerals and implications for paleoatmospheric reconstruction    898
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A. Borisov and R.J. Walker
Os solubility in silicate melts: New efforts and results    912
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Yi-Gang Zhang and John D. Frantz
Enstatite-forsterite-water equilibria at elevated temperatures and pressures    918
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Jean-Louis Robert, Giancarlo Della Ventura, Mark D. Welch, and Frank C. Hawthorne
The OH-F substitution in synthetic pargasite at 1.5 kbar, 850 °C    926
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Maciej Manecki, Patricia A. Maurice, and Samuel J. Traina
Uptake of aqueous Pb by Cl^-, F^-, and OH^- apatites: Mineralogic evidence for nucleation mechanisms    932
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S.G. Eeckhout, E. De Grave, C.A. McCammon, and R. Vochten
Temperature dependence of the hyperfine parameters of synthetic P2₁/c Mg-Fe clinopyroxenes along the MgSiO₃-FeSiO₃ join    943
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Daria Pasqual, Gianmario Molin, and Mario Tribaudino
Single-crystal thermometric calibration of Fe-Mg order-disorder in pigeonites    953
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Mario Tribaudino, Piera Benna, and Emiliano Bruno
TEM observations on the P1 - I1 phase transition in feldspars along the join CaAl₂Si₂O₈-SrAl ₂Si₂O₈    963
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Hongwu Xu, Peter J. Heaney, and George H. Beall
Phase transitions induced by solid solution in stuffed derivatives of quartz: A powder synchrotron XRD study of the LiAlSiO₄-SiO₂ join    971
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Angelika Hülsmans, Martin Schmücker, Werner Mader, and Hartmut Schneider
The transformation of andalusite to mullite and silica: Part I. Transformation mechanism in [001]_A direction    980
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Angelika Hülsmans, Martin Schmücker, Werner Mader, and Hartmut Schneider
The transformation of andalusite to mullite and silica: Part II. Transformation mechanisms in [100]_A and [010]_A directions    987
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Stefan Heinemann and Ronald Miletich
Structure and twinning of tetragonal Ca₃Mn₂Ge₃O₁₂ garnet   993
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N. Chinnery, A.R. Pawley, and S.M. Clark
The equation of state of lawsonite to 7 GPa and 873 K, and calculation of its high pressure stability   1001
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Michael E. Fleet and Swaminathan Muthupari
Boron K-edge XANES of borate and borosilicate minerals    1009
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David J. Sullivan, Jay S. Shore, and James A. Rice
¹¹³Cd double-resonance NMR as a probe of clay mineral cation exchange sites    1022
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Xing Cheng, Peidong Zhao, and Jonathan F. Stebbins
Solid state NMR study of oxygen site exchange and Al-O-Al site concentration in analcime    1030
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Claro I. Sainz-Diaz, Vicente Timon, Vicente Botella, and Alfonso Hernandez-Laguna
Isomorphous substitution effect on the vibration frequencies of hydroxyl groups in molecular cluster models of the clay octahedral sheet    1038
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Andrey G. Kalinichev, R. James Kirkpatrick, and Randall T. Cygan
Molecular modeling of the structure and dynamics of the interlayer and surface species of mixed-metal layered hydroxides: Chloride and water in hydrocalumite (Friedel's salt)   1046
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David Lévy and Jacques Barbier
^VIII(Mg,Fe)_0.85^VI (Mg,Fe)₄^IV(Fe,Ge)₃ O₁₂: A new tetragonal phase and its comparison with garnet    1053
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Volker Kahlenberg, Reinhard X. Fischer, and Cliff S.J. Shaw
Rietveld analysis of dicalcium aluminate (Ca₂Al₂O₅) A new high pressure phase with the Brownmillerite-type structure   1061
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Werner H. Paar, Ronald Miletich, Dan Topa, Alan J. Criddle, Milka K. De Brodtkorb, Georg Amthauer, and Gerold Tippelt
Suredaite, PbSnS₃, a new mineral species from the Pirquitas Ag-Sn deposit, NW-Argentina: Mineralogy and crystal structure    1066
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Ritsuro Miyawaki, Satoshi Matsubara, Kazumi Yokoyama, Koichi Takeuchi, Yasuko Terada, and Izumi Nakai
Kozoite-(Nd), Nd(CO₃)(OH), a new mineral in an alkali olivine basalt from Hizen-cho, Saga Prefecture, Japan    1076
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Andrei V. Ivanov, Michael E. Zolensky, Akihiro Saito, Kazumasa Ohsumi, S. Vincent Yang, Nataliya N. Kononkova, and Takashi Mikouchi
Florenskyite, FeTiP, a new phosphide from the Kaidun meteorite   1082
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LETTERS

John A. Purton, Jon D. Blundy, and Neil L. Allan
Computer simulation of high-temperature, forsterite-melt partitioning   1087
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Presentation of Awards for 1999

Bjorn O. Mysen and Hatten S. Yoder, Jr.
Presentation of the Roebling Medal of the Mineralogical Society of America for 1999 to Ikuo Kushiro   1092
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Ikuo Kushiro
Acceptance of the Roebling Medal of the Mineralogical Society of America for 1999   1094
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Charles T. Prewitt
Presentation of the Mineralogical Society of America Award for 1999 to Yingwei Fei    1097
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Yingwei Fei
Acceptance of the Mineralogical Society of America Award for 1999   1098
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Paul H. Ribbe
Presentation of the Distinguished Public Service Award to Robert A. Howie    1100
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R.A. Howie
Acceptance of the Mineralogical Society of America Public Service Award of 1999    1101
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BOOK REVIEWS   1103
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Donald G. Isaak
Ultrahigh-Pressure Mineralogy: Physics and Chemistry of the Earth's Deep Interior. Russell Hemley, Editor. Mineralogical Society of America, Reviews in Mineralogy, 1998, Vol. 37.

Stephen E. Haggerty
The Nature of Diamonds. Edited by George E. Harlow, Cambridge University Press, 1998.