American Mineralogist, 2003, V 88, N 7, July.

LETTERS 

1161 
Aluminum substitution in MgSiO3 perovskite:
Investigation of multiple mechanisms by 27Al NMR 
Jonathan F. Stebbins, Hiroshi Kojitani,
Masaki Akaogi, and Alexandra Navrotsky 

1165 
Studtite, [(UO2)(O2)(H2O)2](H2O)2: The first
structure of a peroxide mineral 
Peter C. Burns and Karrie-Ann Hughes 

1169 
Nanometer-scale measurements of iron oxidation
states of cronstedtite from primitive meteorites 
Thomas J. Zega, Laurence A. J. Garvie, and Peter R. Buseck 

ARTICLES 


949 
Bonding preferences of non-bridging O atoms: Evidence
from 17O MAS and 3QMAS NMR on calcium aluminate
and low-silica Ca-aluminosilicate glasses 
Jeffrey R. Allwardt, Sung Keun Lee, and Jonathan F. Stebbins 

955 
BNa—BLi solid-solution in A-site-vacant amphiboles:
synthesis and cation ordering along the 
ferri-clinoferroholmquistite—riebeckite join 
Gianluca Iezzi, Giancarlo Della Ventura,
Fernando Camara, Giuseppe Pedrazzi, and Jean-Louis Robert 

962 
A new uranyl carbonate sheet in the crystal structure
of fontanite, Ca[(UO2)3(CO3)2O2](H2O)6 
Karrie-Ann Hughes and Peter C. Burns 

967 
XANES calibrations for the oxidation state
of iron in a silicate glass 
Andrew J. Berry, Hugh St.C. O'Neill, 
Kasthuri D. Jayasuriya, Stewart J. Campbell, 
and Garry J. Foran 
 
978 
Dissolution of strontianite at high P-T conditions: 
An in-situ synchrotron X-ray fluorescence study 
Carmen Sanchez-Valle, Isabelle Martinez, Isabelle Daniel, 
Pascal Philippot, Sylvain Bohic, and Alexandre Simionovici 

986 
Intergrown niobian rutile phases with Sc- and W-rich 
ferrocolumbite: An electron-microprobe and Rietveld study 
Martin Okrusch, Rainer Hock, Ulrich Schussler, 
Amanda Brummer, Markus Baier, and Hans Theisinger 

996 
Bulk moduli and high-pressure crystal structures of 
minium, Pb3O4, determined by X-ray powder diffraction 
Robert E. Dinnebier, Stefan Carlson, Michael Hanfland, 
and Martin Jansen 

1003 
Slow oxygen diffusion rates in igneous zircon
s from metamorphic rocks 
William H. Peck, John W. Valley, and Colin M. Graham 

1015 
Chemistry of grain boundaries in mantle rocks 
Takehiko Hiraga, Ian M. Anderson, and David L. Kohlstedt 

1020 
Heats of mixing of silicate liquid in the systems 
diopside-anorthite-akermanite, 
diopside-anorthite-forsterite, and diopside-silica 
Toru Sugawara and Masaki Akaogi 

1025 
High-pressure crystal structure of kosmochlor, NaCrSi2O6, 
and systematics of anisotropic compression in pyroxenes 
Marcus J. Origlieri, Robert T. Downs, Richard M. Thompson, 
Carolyn J.S. Pommier, M. Bonner Denton, and George E. Harlow 

1033 
Monte Carlo simulations of ordering of Al, Fe, and Mg cations 
in the octahedral sheet of smectites and illites 
C. Ignacio Sainz-Diaz, Erika J. Palin, Martin T. Dove, 
and Alfonso Hernandez-Laguna 

1046 
Influence of F content on the composition of Al-rich synthetic 
phlogopite: Part II. Probing the structural arrangement of 
aluminum in tetrahedral and octahedral layers by 27Al MQMAS 
and 1H/19F-27Al HETCOR and REDOR experiments 
Michael Fechtelkord, Harald Behrens, Francois Holtz, 
Jeremy L. Bretherton, Colin A. Fyfe, Lee A. Groat, 
and Mati Raudsepp 

1055 
Dawsonite: An inclusion mineral in quartz from the
Tin Mountain pegmatite, Black Hills, South Dakota 
Mona-Liza C. Sirbescu and Peter I. Nabelek 

1060 
Hydrogen-bonded water in laumontite II: Experimental 
determination of site-specific thermodynamic 
properties of hydration of the W1 and W5 sites 
Thrainn Fridriksson, J. William Carey, 
David L. Bish, Philip S. Neuhoff, and Dennis K. Bird 

1073 
High P-T phase relations and stability of a (21)-hydrous 
clinopyribole in the system K2O-Na2O-CaO-MgO-Al2O3-SiO2-H2O: 
An experimental study to 18 GPa 
Jurgen Konzett and Stefanie L. Japel 

1084 
The crystal chemistry of julgoldite-Fe3+ from Bombay, 
India, studied using synchrotron X-ray powder 
diffraction and 57Fe Mossbauer spectroscopy 
G. Artioli, C.A. Geiger, and M. Dapiaggi 

1091 Partitioning of Sr, Ba, Rb, Y, and LREE 
between plagioclase and peraluminous silicic magma 
Minghua Ren, Don F. Parker, and John C. White 

1104 
Infrared and TEM characterization of amphiboles 
synthesized near the tremolite-pargasite join 
in the ternary system tremolite-pargasite-cummingtonite 
David M. Jenkins, Krassimir N. Bozhilov, and Kiyotaka Ishida 

1115 Coupling between non-convergent ordering and 
transition temperature in the C2/c — P21/c 
phase transition in pigeonite 
Fernando Camara, Michael A. Carpenter, 
M. Chiara Domeneghetti, and Vittorio Tazzoli 

1129 
57Fe Mossbauer-effect studies of Ca-rich, Fe-bearing 
clinopyroxenes: Part I. Paramagnetic spectra 
of magnesian hedenbergite 
Sigrid G. Eeckhout and Eddy De Grave 

1138 
57Fe Mossbauer-effect studies of Ca-rich, Fe-bearing 
clinopyroxenes: Part II. Magnetic spectra of 
magnesian hedenbergite 
Sigrid G. Eeckhout and Eddy De Grave 

1145 
57Fe Mossbauer-effect studies of Ca-rich, 
Fe-bearing clinopyroxenes: Part III. Diopside
Eddy De Grave and Sigrid G. Eeckhout 

1153 
Ultrahigh-pressure metamorphism in eclogites 
from the western Tianshan high-pressure belt 
(Xinjiang, western China) - Comment 
Reiner Klemd 

1157 
Ultrahigh-pressure metamorphism in eclogites 
from the western Tianshan, China - Reply 
Lifei Zhang, David Ellis, Samansa Williams, 
and Wenbo Jiang 

1173 
An evaluation of spatial correlation functions 
in textural analysis of metamorphic rocks 
David M. Hirsch, Richard A. Ketcham, 
and William D. Carlson 

1174 
Metapelite phase equilibria modeling in MnNCKFMASH: 
The effect of variable Al2O3 and MgO/(MgO + FeO) 
on mineral stability 
Douglas K. Tinkham, Carlos A. Zuluaga, and Harold H. Stowell 

1175
NEW MINERAL NAMES 
Edward S. Grew, Nikola N. Pertsev, and Andrew C. Roberts