American Mineralogist, 2006, V 91, N 4, April.

LETTERS
 
706
Transformation of pentlandite to violarite
under mild hydrothermal conditions 
Christophe Tenailleau, Allan Pring, 
Barbara Etschmann, Joel Brugger, 
Ben Grguric, and Andrew Putnis 

ARTICLES
 
489
Structural model for the biogenic Mn 
oxide produced by Pseudomonas putida 
Mario Villalobos, Bruno Lanson, 
Alain Manceau, Brandy Toner, and 
Garrison Sposito 

503
Electron-beam (5—10 keV) damage in 
triplite-group phosphates: Consequences 
for electron-microprobe analysis 
of fluorine 
Michel Fialin and Christian Chopin 

511
Vacancy defects in MgO at high pressure 
Bijaya B. Karki and Gaurav Khanduja 

517
Plastic flow of pyrope at mantle pressure
and temperature 
Li Li, Hongbo Long, Paul Raterron, 
and Donald Weidner 

526
Parvo-mangano-edenite, parvo-manganotremolite, 
and the solid solution between Ca and 
Mn2+ at the M4 site in amphiboles 
Roberta Oberti, Fernando Camara, 
Giancarlo Della Ventura, Gianluca Iezzi, 
and Alan I. Benimoff 

533
Reinvestigation of the MgSiO3 perovskite 
structure at high pressure 
Masahiko Sugahara, Akira Yoshiasa, 
Yutaka Komatsu, Takamitsu Yamanaka, 
Nathalie Bolfan-Casanova, Akihiko Nakatsuka, 
Satoshi Sasaki, and Masahiko Tanaka 

537
The mechanism and kinetics of a-NiS oxidation 
in the temperature range 670—700 °C 
Haipeng Wang, Allan Pring, Yung Ngothai,
and Brian O'Neill 

544
Influence of charge location on 29Si NMR 
chemical shift of 2:1 phyllosilicates 
Jesus Sanz, Jean-Louis Robert, 
Magali Diaz, and Isabel Sobrados 

551
The size distribution of exsolution 
lamellae in iron-free clinopyroxene 
Stephan Weinbruch, Volker Styrsa,
and Thomas Dirsch 

560
The high-pressure phase transformation 
and breakdown of MgFe2O4 
Sofia Winell, Hans Annersten, and
Vitali Prakapenka 

568
Elastic behavior, phase transition, 
and pressure induced structural 
evolution of analcime 
G. Diego Gatta, Fabrizio Nestola, 
and Tiziana Boffa Ballaran 

579
A new chemical etching technique for 
peridotites using molten anhydrous borax 
Tomohiro Ohuchi 

584
Poppiite, the V3+ end-member of the 
pumpellyite group: Description and 
crystal structure 
Maria Franca Brigatti, Enrico Caprilli, 
and Marco Marchesini 

589
Cation redistribution in the octahedral 
sheet during diagenesis of illite-smectites 
from Jurassic and Cambrian oil source 
rock shales 
Lidia G. Dainyak, Victor A. Drits, 
Bella B. Zviagina, and Holger Lindgreen 

604
A shock-induced polymorph of anatase and 
rutile from the Chesapeake Bay impact 
structure, Virginia, U.S.A. 
John C. Jackson, J. Wright Horton, 
Jr., I-Ming Chou, and Harvey E. Belkin 
 
609
Water in the interlayer region of birnessite: 
Importance in cation exchange and 
structural stability 
Elizabeth A. Johnson and Jeffrey E. Post 

619
In situ HAFM study of the thermal 
dehydration on gypsum (010) surfaces 
Guntram Jordan and Jose Manuel Astilleros 

628
Influence of dehydration kinetics on 
T-O-T bridge breaking in zeolites with 
framework type STI: The case of stellerite 
R. Arletti, E. Mazzucato, and G. Vezzalini 

635
Estimation of volume fractions of liquid 
and vapor phases in fluid inclusions, 
and definition of inclusion shapes 
Ronald J. Bakker and Larryn W. Diamond 

658
Thermodynamics of uranyl minerals: 
Enthalpies of formation of uranyl 
oxide hydrates 
Karrie-Ann Kubatko, Katheryn Helean, 
Alexandra Navrotsky, and Peter C. Burns 

667
SIMS investigation of electron-beam 
damage to hydrous, rhyolitic glasses: 
Implications for melt inclusion analysis 
Madeleine C.S. Humphreys, 
Stuart L. Kearns, and Jon D. Blundy 

680
Synthetic Ag-rich tourmaline: 
Structure and chemistry 
David London, Andreas Ertl, John M. Hughes, 
George B. Morgan VI, Eric A. Fritz, 
and Brian S. Harms 

685
Genesis and compositional heterogeneity 
of smectites. Part III: Alteration of 
basic pyroclastic rocks—A case study 
from the Troodos Ophiolite Complex, 
Cyprus 
George E. Christidis 

702
Ganterite, the barium mica 
Ba0.5K0.5Al2(Al1.5Si2.5)O10(OH)2, 
from Oreana, Nevada 
Chi Ma and George R. Rossman 

710
NEW MINERAL NAMES 
Andrew J. Locock, Paula C. Piilonen, 
T. Scott Ercit, Ralph Rowe, 
and Uwe Kolitsch 

716
ERRATUM 
Oxy-amphibole equilibria in Ti-bearing 
calcic amphiboles: Experimental 
investigation and petrologic 
implications for mantle-derived 
amphiboles by R.K. Popp, H.A. Hibbert, 
and W.M. Lamb (vol. 91, no. 1, 
p. 54–66, DOI: 10.2138/am.2006.1838).