ARTICLES

J.D. Kubicki, G.A. Blake, and S.E. Apitz
Ab initio calculations on aluminosilicate Q³ species: Implications for atomic structures of mineral surfaces and dissolution mechanisms of feldspars   789
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I. Tsatskis and E.K.H. Salje
Time evolution of pericline twin domains in alkali feldspars: A computer simulation study    800
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Tullio Pilati, Francesco Demartin, and Carlo Maria Gramaccioli
Lattice-dynamical evaluation of atomic displacement parameters of minerals and its implications: The example of diopside    811
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D. Andrault, J.-P. Itié, and F. Farges
High-temperature structural study of germanate perovskites and pyroxenoids    822
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Paola Comodi and Pier Francesco Zanazzi
Effects of temperature and pressure on the structure of lawsonite    833
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M. Chiara Domeneghetti, Vittorio Tazzoli, Tiziana Boffa Ballaran, and G. Mario Molin
Orthopyroxene from the Serra de Magé meteorite: A structure-refinement procedure for a Pbca phase coexisting with a C2/c exsolved phase    842
Full Text (468 K)

Paul F. Schofield, Kevin S. Knight, and Iona C. Stretton
Thermal expansion of gypsum investigated by neutron powder diffraction    847
Full Text (448 K)

Victor A. Drits and Douglas K. McCarty
The nature of diffraction effects from illite and illite-smectite consisting of interstratified trans-vacant and cis-vacant 2:1 layers: A semiquantitative technique for determination of layer-type content    852
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Anne Sery, Alain Manceau, and G. Neville Greaves
Chemical state of Cd in apatite phosphate ores as determined by EXAFS spectroscopy    864
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P. Bonazzi, S. Menchetti, G. Pratesi, M. Muniz-Miranda, and G. Sbrana
Light-induced variations in realgar and β-As₄S₄: X-ray diffraction and Raman studies    874
Full Text (560 K)

Lian-Kun Sha and Bruce W. Chappell
Two-site multi-cation ordering-disordering in minerals: An alternative kinetic model    881
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Christelle Demars, Maurice Pagel, Etienne Deloule, and Philippe Blanc
Cathodoluminescence of quartz from sandstones: Interpretation of the UV range by determination of trace element distributions and fluid-inclusion P-T-X properties in authigenic quartz    891
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Brigitte Wopenka, Bradley L. Jolliff, Ernst Zinner, and Daniel T. Kremser
Trace element zoning and incipient metamictization in a lunar zircon: Application of three microprobe techniques    902
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(Contents continued from front cover)

Maria Franca Brigatti, Luca Medici, Emilio Saccani, and Carmela Vaccaro
Crystal chemistry and petrologic significance of Fe³⁺-rich phlogopite from the Tapira carbonatite complex, Brazil    913
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Ulrich Klein, John C. Schumacher, and Michael Czank
Mutual exsolution in hornblende and cummingtonite: Compositions, lamellar orientations, and exsolution temperatures    928
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Marty Grove and T. Mark Harrison
⁴⁰Ar* diffusion in Fe-rich biotite    940
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J. William Carey and David L. Bish
Equilibrium in the clinoptilolite-H₂O system    952
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Sukanya Mukhopadhyay and K.T. Jacob
Phase equilibria in the system CaO-CoO-SiO₂ and Gibbs energies of formation of the quaternary oxides CaCoSi₂O₆, Ca₂CoSi₂O₇, and CaCoSiO₄    963
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Svein Stølen, Ronny Glöckner, Fredrik Grønvold, Tooru Atake, and Satoru Izumisawa
Heat capacity and thermodynamic properties of nearly stoichiometric wüstite from 13 to 450 K    973
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Kéiko Hattori and Hiroaki Sato
Magma evolution recorded in plagioclase zoning in 1991 Pinatubo eruption products    982
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Frank C. Hawthorne, Roberta Oberti, Luciano Ungaretti, and Joel D. Grice
A new hyper-calcic amphibole with Ca at the A site: Fluor-cannilloite from Pargas, Finland    995
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P. Ballirano, A. Maras, and P.R. Buseck
Crystal chemistry and IR spectroscopy of Cl^- and SO₄-bearing cancrinite-like minerals    1003
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NEW MINERAL NAMES    1013

John L. Jambor, Vladimir A. Kovalenker, and Andrew C. Roberts
Full Text (880 K)

MEMORIAL    1018

Cornelius S. Hurlbut Jr. and James B. Thompson Jr.
Memorial of Harold Williams Fairbairn, 1906-1994
Full Text (420 K)

BOOK REVIEW    1020

Patricia A. Maurice
MINERAL SURFACES. Edited by D.J. Vaughan and R.A.D. Pattrick. Chapman and Hall, London, 1995. viii + 370 pages.
Full Text (208 K)