LETTERS

Jeffrey M. Guevremont, Alicia R. Elsetinow, Daniel R. Strongin, Joakim Bebie, and Martin A.A. Schoonen
Structure sensitivity of pyrite oxidation: Comparison of the (100) and (111) planes     1353
Abstract
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H.J. Reichmann, R.J. Angel, H. Spetzler, and W.A. Bassett
Ultrasonic interferometry and X-ray measurements on MgO in a new diamond anvil cell     1352
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M. Darby Dyar, Jeremy S. Delaney, Steven R. Sutton, and Martha Schaefer
Fe³⁺ distribution in oxidized olivine: A synchrotron micro-XANES study     1361
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ARTICLES

K. Tobias Winther, E. Bruce Watson, and Gerald M. Korenowski
Magmatic sulfur compounds and sulfur diffusion in albite melt at 1 GPa and 1300-1500 °C     1141
Abstract
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Christopher J. Capobianco
Ruthenium solubility in hematite    1152
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Clifford S. Todd
Limits on the precision of geobarometry at low grossular and anorthite content    1161
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R. Knoche, R.J. Angel, F. Seifert, and T.F. Fliervoet
Complete substitution of Si for Ti in titanite Ca(Ti_1-xSi_x)^VISi^IVO₅     1168
Abstract
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Thilo Arlt, Ross J. Angel, Ronald Miletich, Thomas Armbruster, and Tjerk Peters
High-pressure P2₁/c-C2/c phase transitions in clinopyroxenes: Influence of cation size and electronic structure     1176
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Deposit Items

Ray L. Frost, J. Theo Kloprogge, Thu Ha Thi Tran, and Janos Kristof
The effect of pressure on the intercalation of an ordered kaolinite     1182
Abstract
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Victor A. Drits, Holger Lindgreen, Alfred L. Salyn, Robert Ylagan, and Douglas K. McCarty
Semiquantitative determination of trans-vacant and cis-vacant 2:1 layers in illites and illite-smectites by thermal analysis and X-ray diffraction     1188
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Douglas M. Yates and Philip E. Rosenberg
Characterization of neoformed illite from hydrothermal experiments at 250 °C and
P_{v, soln}: An HRTEM/ATEM study     1199
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Takashi Murakami, Toshihiro Kogure, Hiroyuki Kadohara, and Toshihiko Ohnuki
Formation of secondary minerals and its effect on anorthite dissolution     1209
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Dean Nevins and Frank J. Spera
Molecular dynamics simulations of molten CaAl₂Si₂O₈: Dependence of structure and properties on pressure     1220
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AMMIAY 83(11-12)1141-1386 ISSN 0003-004X [83(11-12) is mailing in two parts]

(Contents continued from front cover)

Benjamin A. Grguric, Andrew Putnis, and Richard J. Harrison
An investigation of the phase transitions in bornite (Cu₅FeS₄) using neutron diffraction and differential scanning calorimetry     1231
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L.M. Maddox, G.M. Bancroft, M.J. Scaini, and J.W. Lorimer
Invisible gold: Comparison of Au deposition on pyrite and arsenopyrite     1240
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Jeffrey M. Guevremont, Daniel R. Strongin, and Martin A.A. Schoonen
Thermal chemistry of H₂S and H₂O on the (100) plane of pyrite: Unique reactivity of defect sites     1246
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Daniel L. Legrand, H. Wayne Nesbitt, and G. Michael Bancroft
X-ray photoelectron spectroscopic study of a pristine millerite (NiS) surface and the effect of air and water oxidation     1256
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P. Rehak, G. Kunath-Fandrei, P. Losso, B. Hildmann, H. Schneider, and C. Jäger
Study of the Al coordination in mullites with varying Al:Si ratio by ²⁷Al NMR spectroscopy and X-ray diffraction     1266
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Anna M. George, Pascal Richet, and Jonathan F. Stebbins
Cation dynamics and premelting in lithium metasilicate (Li₂SiO₃) and sodium metasilicate (Na₂SiO₃): A high-temperature NMR study     1277
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Peter S. Fiske, William J. Nellis, Zhi Xu, and Jonathan F. Stebbins
Shocked quartz: A ²⁹Si magic-angle spinning nuclear magnetic resonance study     1285
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Anne M. Hofmeister, Rand B. Schaal, Karla R. Campbell, Sandra L. Berry, and Timothy J. Fagan
Prevalence and origin of birefringence in 48 garnets from the pyrope-almandine-grossularite-spessartine quaternary     1293
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Hans-Jürgen Förster
The chemical composition of REE-Y-Th-U rich accessory minerals in peraluminous granites of the Erzgebirge-Fichtelgebirge region, Germany. Part II: Xenotime     1302
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Isamu Shinno and Zhe Li
Octahedral site Fe²⁺ quadrupole splitting distributions from the Mössbauer spectra of arrojadite     1316
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Ian E. Grey, Danielle Velde, and Alan J. Criddle
Haggertyite, a new magnetoplumbite-type titanate mineral from the Prairie Creek (Arkansas) lamproite     1323
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Paolo Orlandi, Marco Pasero, and Giovanna Vezzalini
Scandiobabingtonite, a new mineral from the Baveno pegmatite, Piedmont, Italy     1330
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David K. Teertstra, Petr Cerny, Frank C. Hawthorne, Julie Pier, Lu-Min Wang, and Rodney C. Ewing
Rubicline, a new feldspar from San Piero in Campo, Elba, Italy     1335
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Vladimír Bouska, Ivana Císarová, Roman Skála, Zdenek Dvorák, Jaroslav Zelinka, and Karel Zák
Hartite from Bílina     1340
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NEW MINERAL NAMES    1347

John L. Jambor, Edward S. Grew, and Andrew C. Roberts
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SPECIAL NOTICE: WEB PAPER Nomenclature of the micas     1366
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ERRATA    1367

TEM investigator on K-Ca feldspar inclusions in a Bøggild plagioclase, by Takeshi Hoshi and Tokuhei Tagai. American Mineralogist, v. 82, 1073-1078, 1997.

Selective preservation of melt inclusions in igneous phenocrysts, by Stephen Tait, Laboratoire de Dynamrque des Systemes Geologiques, Institut de Physique du Globe 4, Place Jussieu 75252 Paris, France, American Mineralogist, v.77 ,146-155,1992
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AUTHOR INDEX    1369
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SUBJECT INDEX    1377
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