829

Order and miscibility in the otavite–magnesite solid solution
F.A. Bromiley, T. Boffa Ballaran, F. Langenhorst, and F. Seifert

837

An infrared investigation of the otavite–magnesite solid solution
Fiona A. Bromiley, Tiziana Boffa Ballaran, and Ming Zhang

973

Crystal chemistry of hydration in aluminous orthopyroxene
Joseph R. Smyth, Katrin Mierdel, Hans Keppler, Falko Langenhorst, Leonid Dubrovinsky, and Fabrizio Nestola

713

Single-crystal FTIR and X-ray study of vishnevite, ideally [Na₆(SO₄)][Na₂(H₂O)₂](Si₆Al₆O₂₄)
Giancarlo Della Ventura, Fabio Bellatreccia, Gian Carlo Parodi, Fernando Cámara, and Massimo Piccinini

722

Crystallographic texture and microstructure of terebratulide brachiopod shell calcite: An optimized materials design with hierarchical architecture
Erika Griesshaber, Wolfgang W. Schmahl, Rolf Neuser, Thomas Pettke, Michael Blüm, Jürg Mutterlose, and Uwe Brand

735

High-temperature phase relations and topological constraints in the quaternary system MgO-Al₂O₃-SiO₂-Cr₂O₃: An experimental study
Cristiano Brigida, Stefano Poli, and Massimiliano Valle

748

Tilt and buckling modes, and acoustic anisotropy in layers with post-perovskite connectivity
Ian P. Swainson and André L. Yonkeu

753

Optical absorption study of natural garnets of almandine-skiagite composition showing intervalence Fe²⁺ + Fe³⁺ → Fe³⁺ + Fe²⁺ charge-transfer transition
Michail N. Taran, M. Darby Dyar, and Stanislav S. Matsyuk

761

Deriving formation constants for aqueous metal complexes from XANES spectra: Zn²⁺ and Fe²⁺ chloride complexes in hypersaline solutions
Weihua Liu, Barbara Etschmann, Garry Foran, Michael Shelley, and Joël Brugger

771

Birnessite polytype systematics and identification by powder X-ray diffraction
Victor A. Drits, Bruno Lanson, and Anne-Claire Gaillot

789

Improved measurement of fission-track annealing in apatite using c-axis projection
Richard A. Ketcham, Andrew Carter, Raymond A. Donelick, Jocelyn Barbarand, and Anthony J. Hurford

799

Improved modeling of fission-track annealing in apatite
Richard A. Ketcham, Andrew Carter, Raymond A. Donelick, Jocelyn Barbarand, and Anthony J. Hurford

811

Intercalibration of FTIR and SIMS for hydrogen measurements in glasses and nominally anhydrous minerals
Cyril Aubaud, Anthony C. Withers, Marc M. Hirschmann, Yunbin Guan, Laurie A. Leshin, Stephen J. Mackwell, and David R. Bell

844

Partitioning of calcium, magnesium, and transition metals between olivine and melt governed by the structure of the silicate melt at ambient pressure
Bjorn Mysen

863

The geometric effects of ^VFe²⁺ for ^VMg substitution on the crystal structures of the grandidierite-ominelite series
Tashia J. Dzikowski, Lee A. Groat, and Edward S. Grew

873

The iron oxidation state of garnet by electron microprobe: Its determination with the flank method combined with major-element analysis
Heidi E. Höfer and Gerhard P. Brey

886

Gram-Charlier development of the atomic displacement factors into mineral structures: The case of samsonite, Ag₄MnSb₂S₆
Luca Bindi and Michel Evain

892

Superstructure of Challis mordenite with doubled monoclinic unit cell
Naoyuki Kawame, Daijo Ikuta, Hideki Kanazawa, Kazuhiko Ito, Mickey E. Gunter, Monte B. Boisen, and Osamu Tamada

898

Biopyribole evolution during tremolite synthesis from dolomite and quartz in CO₂-H₂O fluid
Krassimir N. Bozhilov, Daniel Brownstein, and David M. Jenkins

909

The evolution of diamond morphology in the process of dissolution: Experimental data
Alexander F. Khokhryakov and Yuri N. Pal’yanov

918

The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules
Luca Bindi, Michel Evain, Paul G. Spry, and Silvio Menchetti

926

Determination of layer stacking microstructures and intralayer transition of illite polytypes by high-resolution transmission electron microscopy (HRTEM)
Tao Chen and Hejing Wang

933

Structural behavior of Al³⁺ in peralkaline, metaluminous, and peraluminous silicate melts and glasses at ambient pressure
Bjorn O. Mysen and Michael J. Toplis

947

The crystal structure of ingersonite, Ca₃Mn²⁺Sb⁵⁺₄O₁₄, and its relationships with pyrochlore
Paola Bonazzi and Luca Bindi

954

Chemical composition, statistical analysis of the unit cell, and electrostatic modeling of the structure of Al-saturated chlorite from metamorphosed rocks
Sang Soo Lee, Stephen Guggenheim, M. Darby Dyar, and Charles V. Guidotti

966

XANES study of the oxidation state of Cr in lower mantle phases: Periclase and magnesium silicate perovskite
Sigrid Griet Eeckhout, Nathalie Bolfan-Casanova, Catherine McCammon, Stephan Klemme, and Elodie Amiguet

979

Acceptance of the Mineralogical Society of America Roebling Medal for 2006
W.G. Ernst

980

Presentation of the Mineralogical Society of America Award for 2006 to Daniel J. Frost
David Rubie

981

Acceptance of the Mineralogical Society of America Award for 2006
Daniel J. Frost

983

Presentation of the Distinguished Public Service Medal of the Mineralogical Society of America for 2007 to Marie Huizing
John Rakovan

984

Acceptance of the Distinguished Public Service Medal for 2007
Marie Huizing

985

BOOK REVIEW: VOLCANISM IN THE CAMPANIA PLAIN: VESUVIUS, CAMPI FLEGREI AND IGNIMBRITES, Edited by B. De Vivo, Elsevier Developments in Volcanology 9, Amsterdam, 324 p. (2006) ISBN 0444521766
Kenneth H. Wohletz

987

American Mineralogist thanks the year 2006 reviewers

977

Presentation of the Roebling Medal for 2006 of the Mineralogical Society of America to W. Gary Ernst
Peter J. Wyllie

988

ERRATUM: Armbrusterite, K₅Na₆Mn³⁺Mn²⁺₁₄[Si₉O²²]⁴(OH)₁₀·4H₂O, a new Mn hydrous heterophyllosilicate from the Khibiny alkaline massif, Kola Peninsula, Russia by Victor N. Yakovenchuk, Sergey V. Krivovichev, Yakov A. Pakhomovsky, Gregory Yu. Ivanyuk, and Ekaterina A. Selivanova (vol. 92, p. 416-423, 2007; erratum DOI: 10.2138/am.2007.496)