American Mineralogist, 2004, V 89, N 7, July.

 LETTERS 

1138 
Incorporation of sodium into the chlorite structure:
the crystal structure of glagolevite, 
Na(Mg,Al)6[Si3AlO10](OH,O)8 
Sergey V. Krivovichev, Thomas Armbruster, Natalia I. Organova, 
Peter C. Burns, Maxim V. Seredkin, and Nikita V. Chukanov 

1142
Cation disorder in dolomite, CaMg(CO3)2, and its
influence on the aragonite + magnesite - 
dolomite reaction boundary 
Sytle M. Antao, Willem H. Mulder, Ishmael Hassan, 
Wilson A. Crichton, and John B. Parise 

ARTICLES 

 921
 Hydroxyl in omphacites and omphacitic clinopyroxenes
 of upper mantle to lower crustal origin beneath 
 the Siberian platform 
 Monika Koch-Muller, Stanislav S. Matsyuk,
 and Richard Wirth 

932 
Structural variations induced by difference of the 
inert pair effect in the stibnite-bismuthinite 
solid solution series (Sb,Bi)2S3 
Atsushi Kyono and Mitsuyoshi Kimata 

941 
Hydrogen solubility and speciation in natural,
gem-quality chromian diopside 
Geoffrey D. Bromiley, Hans Keppler, 
Catherine McCammon, Fiona A. Bromiley, 
and Steven D. Jacobsen 

950 
Ultrastructure, aggregation-state, and crystal 
growth of biogenic nanocrystalline sphalerite and wurtzite 
John W. Moreau, Richard I. Webb, and Jillian F. Banfield 
   
961 
Impactite from Henbury, Australia 
Yang Ding and David R. Veblen 
 
969
Neutron and synchrotron X-ray diffraction study 
of the structures and dehydration behaviors 
of ramsdellite and "groutellite" 
Jeffrey E. Post and Peter J. Heaney 

976 
Hydrothermal synthesis and crystal chemistry 
of the new strontium uranyl selenites,
Sr[(UO2)3(SeO3)2O2]·4H2O and Sr[UO2(SeO3)2] 
Philip M. Almond and 
Thomas E. Albrecht-Schmitt 

981 
Study of cation order-disorder in MgAl2O4 
spinel by in situ neutron diffraction up 
to 1600 K and 3.2 GPa 
Fabienne Meducin, Simon A.T. Redfern, 
Yann Le Godec, Howard J. Stone, Matt G. Tucker, 
Martin T. Dove, and William G. Marshall 

987 
Magnetic granulometry from equilibrium 
magnetization measurements: Mineral 
magnetometry of superparamagnetic particles 
and application to synthetic ferrihydrites 
Denis G. Rancourt, Fedora Gonzalez-Lucena, 
and Pierre-Jean Thibault 

998 
Hydroxide in kyanite: A quantitative determination 
of the absolute amount and calibration of the IR spectrum 
David. R. Bell, George R. Rossman, 
Joachim Maldener, Denis Endisch, and Friedel Rauch 

1004
Analysis of uranyl-bearing phases by EXAFS spectroscopy:
Interferences, multiple scattering, accuracy of 
structural parameters, and spectral differences 
Jeffrey G. Catalano and Gordon E. Brown Jr. 
 
1022 
X-ray diffraction evidence for a monoclinic form 
of stibnite, Sb2S3, below 290 K 
Satoru Kuze, Douglas Du Boulay, Nobuo Ishizawa,
Atsushi Saiki, and Allan Pring 

1026 
Sulfur species at chalcopyrite (CuFeS2) fracture surfaces 
Sarah L. Harmer, Allen R. Pratt, Wayne H. Nesbitt, 
and Michal E. Fleet 

1033
Dehydration and rehydration process in boggsite: 
An in situ X-ray single-crystal study 
Stefano Zanardi, Giuseppe Cruciani,
Alberto Alberti, and Ermanno Galli 

1043 
Empressite, AgTe, from the Empress-Josephine mine, 
Colorado, U.S.A.: Composition, physical properties, 
and determination of the crystal structure 
Luca Bindi, Paul G. Spry, and Curzio Cipriani 

1048 
Correlation of pH-dependent surface interaction 
forces to amino acid adsorption: Implications 
for the origin of life 
Hugh Churchill, Henry Teng, and Robert M. Hazen 

1056 
A near-infrared spectroscopic study of hydroxyl
in natural chondrodite 
P.S.R. Prasad and L.P. Sarma 

1061 
High-pressure elasticity of a natural magnetite crystal 
Hans J. Reichmann and Steven D. Jacobsen 

1067 
Isotopic and chemical alteration of zircon by metamorphic
fluids: U-Pb age depth-profiling of zircon crystals from 
Barrow's garnet zone, northeast Scotland 
Christopher M. Breeding, Jay J. Ague, Marty Grove, 
and Andrew L. Rupke 

1078 
A novel approach to determine high-pressure high-temperature 
fluid and melt compositions using diamond-trap experiments 
Ronit Kessel, Peter Ulmer, Thomas Pettke, 
Max W. Schmidt, and Alan B. Thompson 

1087
Lindbergite, a new Mn oxalate dihydrate from Boca Rica 
mine, Galileia, Minas Gerais, Brazil, and other occurrences 
Daniel Atencio, Jose M.V. Coutinho, Stefan Graeser,
Paulo A. Matioli, and Luiz A.D. Menezes Filho 

1092 
Pyrophyllite dehydroxylation process by First 
Principles calculations 
C. Ignacio Sainz-Diaz, Elizabeth Escamilla-Roa, 
and Alfonso Hernandez-Laguna 

1101 
Plagioclase from planetary basalts: Chemical 
signatures that reflect planetary volatile budgets, 
oxygen fugacity, and styles of igneous differentiation 
Jim Karner, J.J. Papike, and C.K. Shearer 

1110 
The structure of the manganese oxide on the sheath 
of the bacterium Leptothrix discophora: An XAFS study 
Astrid Jurgensen, Joline R. Widmeyer, 
Robert A. Gordon, Leah I. Bendell-Young, 
Margo M. Moore, and E. Daryl Crozier 

1119 
An X-ray Rietveld study of piemontite on the join 
Ca2Al3Si3O12(OH) - Ca2Mn3+3Si3O12(OH)
formed by hydrothermal synthesis 
Mariko Nagashima and Masahide Akasaka 

1130 
Raman spectroscopy of basic copper(II) and some 
complex copper(II) sulfate minerals: Implications 
for hydrogen bonding
Ray L. Frost, Peter A. Williams, Wayde Martens,
Peter Leverett, and J. Theo Kloprogge 

1148 
Ordering in spinels—A Monte Carlo study: Discussion 
Giovanni B. Andreozzi, Francesco Princivalle,
Henrik Skogby, and Antonio Della Giusta 

1149 
Ordering in spinels—A Monte Carlo study: Reply 
M. Yu. Lavrentiev, J. A. Purton, and N.L. Allan 

1150
BOOK REVIEWS 
Anthony R. Kampf 
MINERALS OF NEVADA By Stephen B. Castor and 
Gregory C. Ferdock, Nevada Bureau of Mines and 
Geology, Special publication 31. University of 
Nevada Press, Reno and Las Vegas; 2004, 512 p. 

Mike Murrell 
URANIUM-SERIES GEOCHEMISTRY by B. Bourdon, 
G.M. Henderson, C.C. Lundstrom, and S.P. Turner (eds.). 
Mineralogical Society of America Reviews in Mineralogy 
and Geochemistry, Vol. 52, 2003, 656 p. 

Don L. Anderson 
INTRODUCTION TO THE PHYSICS OF THE
EARTH'S INTERIOR. Second Edition, by Jean-Paul 
Poirier Cambridge University Press, 2000 312 pp. 
 
Spec Clathrate Hydrates special section - upcoming 
in the August/September 2004 issue 
of American Mineralogist