LETTERS

Akihiko Nakatsuka, Akira Yoshiasa, Takamitsu Yamanaka, and Eiji Ito
Structure refinement of birefringent Cr-bearing majorite Mg₃(Mg_0.34Si_0.34Al_0.18Cr_0.14)₂Si₃O₁₂   199
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Yingwei Fei, Daniel J. Frost, Ho-Kwang Mao, Charles T. Prewitt, and Daniel Häusermann
In situ structure determination of the high-pressure phase of Fe₃O₄ 203
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Christian Chateau, Julian Haines, Jean-Michel Léger, André LeSauze, and Roger Marchand
A moganite-type phase in the silica analog phosphorus oxynitride 207
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ARTICLES

Roger Powell and Tim Holland
Relating formulations of the thermodynamics of mineral solid solutions: Activity modeling of pyroxenes, amphiboles, and micas 1
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A.A. Graphchikov, A.N. Konilov, and J.D. Clemens
Biotite dehydration, partial melting, and fluid composition: Experiments in the system KAlO₂-FeO-MgO-SiO₂-H₂O-CO₂ 15
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F. Holtz, J. Roux, S. Ohlhorst, H. Behrens, and F. Schulze
The effects of silica and water on the viscosity of hydrous quartzofeldspathic melts 27
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Gregor Markl and Sandra Piazolo
Stability of high-Al titanite from low-pressure calcsilicates in light of fluid and host-rock composition 37
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Mark J. Davis and Phillip D. Ihinger
New controlled rapid quench technique in a 1 atm infrared image furnace 48
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Alfonso Pesquera, Jose Torres-Ruiz, Pedro P. Gil-Crespo, and Nicolas Velilla
Chemistry and genetic implications of tourmaline and Li-F-Cs micas from the Valdeflores area (Cáceres, Spain) 55
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Michel Fialin, Hubert Rémy, Claudine Richard, and Christiane Wagner
Trace element analysis with the electron microprobe: New data and perspectives 70
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Vladimir N. Sobolev, Catherine A. McCammon, Lawrence A. Taylor, Gregory A. Snyder, and Nikolai V. Sobolev
Precise Mössbauer milliprobe determination of ferric iron in rock-forming minerals and limitations of electron microprobe analysis 78
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Jean-Louis Robert, Giancarlo Della Ventura, and Frank C. Hawthorne
Near-infrared study of short-range disorder of OH and F in monoclinic amphiboles 86
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Thomas Armbruster
Si,Al ordering in the double-ring silicate armenite, BaCa₂Al₆Si₉O₃₀•2H₂O: A single-crystal X-ray and ²⁹Si MAS NMR study 92
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(Contents continued from front cover)

Roberta Oberti, Frank C. Hawthorne, Fernando Camara, and Mati Raudsepp
Unusual M³⁺ cations in synthetic amphiboles with nominal fluro-eckermannite composition: Deviations from stoichiometry and structural effects of the cummingtonite component 102
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Deposit items

Giuseppe Cruciani and Alessandro Gualtieri
Dehydration dynamics of analcime by in situ synchrotron powder diffraction 112
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Piera Benna, Mario Tribaudino, and Emiliano Bruno
High temperature in situ structural investigation on lead feldspar 120
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Hexiong Yang and Robert M. Hazen
Comparative high-pressure crystal chemistry of karrooite, MgTi₂O₅, with different ordering states 130
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Duncan J. Harris, Graeme W. Watson, and Stephen C. Parker
Computer simulation of pressure-induced structural transitions in MgO [001] tilt grain boundaries 138
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Guntram Jordan, Steven R. Higgins, and Carrick M. Eggleston
Dissolution of the periclase (001) surface: A scanning force microscope study 144
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R. Lee Penn, Jillian F. Banfield, and Derrill M. Kerrick
TEM investigation of Lewiston, Idaho, fibrolite: Microstructure and grain boundary energetics 152
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David Schmidt and Kenneth J.T. Livi
HRTEM and SAED investigations of polytypism, stacking disorder, crystal growth, and vacancies in chlorites from subgreenschist facies outcrops 160
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Junji Akai, Kurumi Akai, Makato Ito, Satoshi Nakano, Yonosuke Maki, and Ichiro Sasagawa
Biologically induced iron-ore at Gunma iron mine, Japan 171
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Barbara Ransom, Richard H. Bennett, Roy Baerwald, Matthew H. Hulbert, and Patti-Jo Burkett
In situ conditions and interactions between microbes and minerals in fine-grained marine sediments: A TEM microfabric perspective 183
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NEW MINERAL NAMES   193

John L. Jambor and Andrew C. Roberts
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BOOK REVIEWS   211

ERRATUM   212