ARTICLES

Brian L. Phillips, Martin D. McGuinn, and Simon A.T. Redfern
Si-Al order and the I1 - I 2/c structural phase transition in synthetic CaAl₂Si₂O₈- SrAl₂Si₂O₈ feldspar: A ²⁹Si MAS-NMR spectroscopic study   1
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Martin T. Dove and Simon A.T. Redfern
Lattice simulation studies of the ferroelastic phase transitions in (Na,K)AlSi₃O₈ and (Sr,Ca)Al₂Si₂O₈ feldspar solid solutions   8
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David C. Palmer, Martin T. Dove, Richard M. Ibberson, and Brian M. Powell
Structural behavior, crystal chemistry, and phase transitions in substituted leucite: High-resolution neutron powder diffraction studies   16
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Ming Zhang, Ekhard Salje, and Ulrich Bismayer
Structural phase transition near 825 K in titanite: Evidence from infrared spectroscopic observations    30
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François Farges
Coordination of Ti⁴⁺ in silicate glasses: A high-resolution XANES spectroscopy study at the Ti K edge    36
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François Farges
Fivefold-coordinated Ti⁴⁺ in metamict zirconolite and titanite: A new occurrence shown by Ti K-edge XANES spectroscopy    44
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B.B. Karki, L. Stixrude, S.J. Clark, M.C. Warren, G.J. Ackland, and J. Crain
Structure and elasticity of MgO at high pressure   51
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Paola Comodi and Pier Francesco Zanazzi
The pressure behavior of clinozoisite and zoisite: An X-ray diffraction study   61
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Tzy-chung Wu, William A. Bassett, Wuu-Liang Huang, Stephen Guggenheim, and August F. Koster van Groos
Montmorillonite under high H₂O pressures: Stability of hydrate phases, rehydration hysteresis, and the effect of interlayer cations   69
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Victor A. Drits, Holger Lindgreen, and Alfred L. Salyn
Determination of the content and distribution of fixed ammonium in illite-smectite by X-ray diffraction: Application to North Sea illite-smectite   79
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Eugene A. Smelik and H.E. King Jr.
Crystal-growth studies of natural gas clathrate hydrates using a pressurized optical cel   88
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Hongwu Xu and Peter J. Heaney
Memory effects of domain structures during displacive phase transitions: A high-temperature TEM study of quartz and anorthite   99
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Daniel Beaufort, Alain Baronnet, Bruno Lanson, and Alain Meunier
Corrensite: A single phase or a mixed-layer phyllosilicate in the saponite-to-chlorite conversion series? A case study of Sancerre-Couy deep drill hole (France)   109
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Huifang Xu, Peter R. Buseck, and Michael A. Carpenter
Twinning in synthetic anorthite: A transmission electron microscopy investigation   125
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Richard J. Harrison and Andrew Putnis
Interaction between exsolution microstructures and magnetic properties of the magnetite-spinel solid solution   131
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Hiroyuki Horiuchi, Akihiro Saito, Toshinaga Tachi, and Hiroshi Nagasawa
Structure of synthetic Li₂(Mg,Cu)Cu₂[Si₂O₆]₂: A unique chain silicate related to pyroxene   143
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Guy L. Hovis
Hydrofluoric acid solution calorimetric investigation of the effects of anorthite component on enthalpies of K-Na mixing in feldspars   149
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Guy L. Hovis and Ann Graeme-Barber
Volumes of K-Na mixing for low albite-microcline crystalline solutions at elevated temperature: A test of regular solution thermodynamic models   158
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Biswajit Mukhopadhyay, M.J. Holdaway, and Andrea M. Koziol
A statistical model of thermodynamic mixing properties of Ca-Mg-Fe²⁺ garnets   165
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Michael E. Fleet and A. Hamid Mumin
Gold-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin Trend gold deposits and laboratory synthesis   182
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Gregor Markl and John C. Schumacher
Beryl stability in local hydrothermal and chemical environments in a mineralized granite   194
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Enver Murad
Identification of minor amounts of anatase in kaolins by Raman spectroscopy   203
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NEW MINERAL NAMES    207
John L. Jambor And Andrew C. Roberts
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MEMORIAL    211
Pavel Povondra
Memorial of Frantisek Cech, 1929-1995    
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ERRATUM    212
George A. Lager
Neutron powder diffraction study of hydrogarnet to 9.0 GPa, by George A. Lager and Robert B. Yon Dreele (v. 81, 1097-1104, 1996).
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