American Mineralogist, 1998, V 83, N 5-6, May-June.

LETTERS

Thilo Arlt, Thomas Armbruster, Peter Ulmer, and Tjerk Peters
MnSi2O5 with the titanite structure: A new high-pressure phase 
in the MnO-SiO2 binary 
p. 657

Yeongkyoo Kim and R. James Kirkpatrick
NMR T1 relaxation study of 133Cs and 23Na adsorbed on illite 
p. 661


ARTICLES

Bruce S. Hemingway, Steven R. Bohlen, W.B. Hankins, 
Edgar F. Westrum Jr., and Oleg L Kuskov
Heat capacity and thermodynamic properties for coesite and jadeite,
reexamination of the quartz-coesite equilibrium boundary 
p. 409

Tiziana Boffa Ballaran, Michael A. Carpenter, M. Chiara Domeneghetti, 
Vittorio Tazzoli
Structural mechanisms of solid solution and cation ordering in
augite-jadeite pyroxenes: I. A macroscopic perspective 
p. 419

Deposit Tables 3, 6, and 7

Tiziana Boffa Ballaran, Michael A. Carpenter, M. Chiara Domeneghetti,
Ekhard K.H. Salje, and Vittorio Tazzoli
Structural mechanisms of solid solution and cation ordering in
augite-jadeite pyroxenes: II. A microscopic perspective 
p. 434

Lucy M. Flesch, Baosheng Li, and Robert C. Liebermann
Sound velocities of polycrystalline MgSiO3-orthopyroxene 
to 10 GPa at room temperature 
p. 444

Igor I. Mazin, Yingwei Fei, Robert Downs, and Ronald Cohen
Possible polytypism in FeO at high pressures 
p. 451

Bernard W. Evans and Hexiong Yang
Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite 
at ambient and high temperature 
p. 458

Deposit Tables 5 and 6

Kenton D. Hammonds, Anne Bosenick, Martin T. Dove, and Volker Heine
Rigid unit modes in crystal structures with octahedrally 
coordinated atoms
p. 476

Michael J. Toplis
Energy barriers to viscous flow and the prediction of glass transition
temperatures of molten silicates 
p. 480

Claude Herzberg and Jianzhong Zhang
Melting experiments in the systems CaO-MgO-Al2O3-SiO2 and 
MgO-SiO2 at 3 to15 GPa 
p. 491

Andreas Lüttge, Udo Neumann, and Antonio C. Lasaga
The influence of heating rate on the kinetics of mineral reactions: 
An experimental study and computer models 
p. 501

Alexandre Zotov, Alexandre Mukhamet-Galeev, and Jacques Schott
An experimental study of kaolinite and dickite relative stability at
150-300 °C and the thermodynamic properties of dickite 
p. 516

Yves Fuchs, Martine Lagache, and Jorge Linares
 Fe-tourmaline synthesis under different T and FO2 conditions 
p. 525

Jung Ho Ahn and Peter R. Buseck
Transmission electron microscopy of muscovite alteration of tourmaline 
p. 535

Huifang Xu, Peter R. Buseck, and Gufeng Luo
HRTEM investigation of microstructures in a length-slow chalcedony 
p. 542

Elke Meissner, Thomas G. Sharp, and Sumit Chakraborty
Quantitative measurement of short compositional profiles usin