ARTICLES

Chin-Ho Tsai and Juhn G. Liou
Eclogite-facies relics and inferred ultrahigh-pressure metamorphism in the North Dabie Complex, central-eastern China    1
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Edward D. Ghent and Terence M. Gordon
Application of INVEQ to the geothermobarometry of metamorphic rocks near a kyanite-sillimanite isograd, Mica Creek, British Columbia    9
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Scott D. Sitzman, Jillian F. Banfield, and John W. Valley
Microstructural characterization of metamorphic magnetite crystals with implications for oxygen isotope distribution     14
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Igor Broska, Igor Petrík, and C. Terry Williams
Coexisting monazite and allanite in peraluminous granitoids of the Tribec Mountains, Western Carpathians    22
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Nikolai Bagdassarov, Alexander Dorfman, and Donald B. Dingwell
Effect of alkalis, phosphorus, and water on the surface tension of haplogranite melt    33
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Liping Wang, Eric J. Essene, and Youxue Zhang
Direct observation of immiscibility in pyrope- almandine-grossular garnet    41
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Dougal A. Jerram and Michael J. Cheadle
On the cluster analysis of grains and crystals in rocks    47
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Roland Stalder, Peter Ulmer, Alan B. Thompson, and Detlef Günther
Experimental approach to constrain second critical end points in fluid/silicate systems: Near-solidus fluids and melts in the system albite-H₂O    68
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P. Garofalo, A. Audétat, D. Günther, C.A. Heinrich, and J. Ridley
Estimation and testing of standard molar thermodynamic properties of tourmaline end-members using data of natural samples    78
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Luisa Ottolini, Fernando Cámara, and Simona Bigi
An investigation of matrix effects in the analysis of fluorine in humite-group minerals by EMPA, SIMS, and SREF    89
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Fernando Cámara and Luisa Ottolini
New data on the crystal-chemistry of fluoborite by means of SREF, SIMS, and EMP analysis    103
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Claudia Romano, Eleonora Paris, Brent T. Poe, Gabriele Giuli, Donald B. Dingwell, and Annibale Mottana
Effect of aluminum on Ti-coordination in silicate glasses: A XANES study    108
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Sing-Foong Cheah, Gordon E. Brown Jr., and George A. Parks
XAFS study of Cu model compounds and Cu²⁺ sorption products on amorphous SiO₂, γ-Al₂O₃, and anatase     118
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A. Manceau, B. Lanson, V.A. Drits, D. Chateigner, W.P. Gates, J. Wu, D. Huo, and J. W. Stucki
Oxidation-reduction mechanism of iron in dioctahedral smectites: I. Crystal chemistry of oxidized reference nontronites    133
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A. Manceau, V.A. Drits, B. Lanson, D. Chateigner, J. Wu, D. Huo, W.P. Gates, and J.W. Stucki
Oxidation-reduction mechanism of iron in dioctahedral smectites: II. Crystal chemistry of reduced Garfield nontronite     153
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Xiaoqiang Hou, R. James Kirkpatrick, Ping Yu, Duane Moore, and Yeongkyoo Kim
¹⁵N NMR study of nitrate ion structure and dynamics in hydrotalcite-like compounds     173
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Brian L. Phillips, Hongwu Xu, Peter J. Heaney, and Alexandra Navrotsky
²⁹Si and ²⁷Al MAS-NMR spectroscopy of β-eucryptite (LiAlSiO₄): The enthalpy of Si,Al ordering     181
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John B. Parise, William G. Marshall, Ronald I. Smith, H.D. Lutz, and Hendrik Möller
The nuclear and magnetic structure of "white rust" Fe(OH_0.86D_0.14)₂     189
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Richard J. Harrison, Simon A.T. Redfern, and Ron I. Smith
In-situ study of the R3 to R3c phase transition in the ilmenite-hematite solid solution using time-of-flight neutron powder diffraction    194
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Klaus-D. Grevel, Elke Ursula Nowlan, Detlef W. Fasshauer, and Michael Burchard
In situ X-ray diffraction investigation of lawsonite and zoisite at high pressures and temperatures     206
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Diana K. Fisler, Julian D. Gale, and Randall T. Cygan
A shell model for the simulation of rhombohedral carbonate minerals and their point defects    217
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Jennifer L. Palmer and Mickey E. Gunter
Optical properties of natural and cation-exchanged heulandite group zeolites     225
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Fabio Marchetti and Natale Perchiazzi
The crystal structure of gearksutite, CaAlF₄(OH)H₂O    231
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Frank C. Hawthorne, Mark A. Cooper, Joel D. Grice, and Luisa Ottolini
A new anhydrous amphibole from the Eifel region, Germany: Description and crystal structure of obertiite,
NaNa₂(Mg₃Fe³⁺Ti ⁴⁺)Si₈O₂₂O₂    236
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Edwin Gnos and Thomas Armbruster
Kinoshitalite, Ba(Mg)₃(Al₂Si₂)O ₁₀(OH,F)₂, a brittle mica from a manganese deposit in Oman: Paragenesis and crystal chemistry    242
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Yunxiang Ni, Jeffrey E. Post, and John M. Hughes
The crystal structure of parisite-(Ce), Ce₂CaF₂(CO₃) ₃    251
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LETTER

Hexiong Yang and Jürgen Konzett
High-pressure synthesis of
Na₂Mg₆Si₆O ₁₈(OH)₂ - a new hydrous silicate phase isostructural with aenigmatite     259
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NEW MINERAL NAMES     263

John L. Jambor and Andrew C. Roberts
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BOOK REVIEW     267

Kenneth H. Wohletz
The Physics of Explosive Volcanic Eruptions. Edited by J. S. Gilbert and R. S. J. Sparks. Geological Society, Special Publication No. 145, 1998.
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