ARTICLES

C. Closmann, Q. Williams
In-situ spectroscopic investigation of high-pressure hydrated (Mg,Fe)SiO₃ glasses: OH vibrations as a probe of glass structure   201
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Richard J. Harrison, Andrew Putnis
Magnetic properties of the magnetite-spinel solid solution: Saturation magnetization and cation distributions   213
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Thomas S. Duffy, Charles Meade, Yingwei Fei, Ho-Kwang Mao, Russell J. Hemley
High-pressure phase transition in brucite, Mg(OH)₂   222
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Kunal Bose, Jibamitra Ganguly
Quartz-coesite transition revisited: Reversed experimental determination at 500-1200 °C and retrieved thermochemical properties   231
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T. P. Hackwell, R. J. Angel
Reversed brackets for the P1 ↔ I1 transition in anorthite at high pressures and temperatures   39
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Hans J. Jakobsen, Niels C. Nielsen, Holger Lindgreen
Sequences of charged sheets in rectorite   247
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M. Chiara Domeneghetti, G. Mario Molin, Vittorio Tazzoli
A crystal-chemical model for Pbca orthopyroxene   253
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Christina M. B. Line, Andrew Putnis, Christine Putnis, Ciriaco Giampaolo
The dehydration kinetics and microtexture of analcime from two parageneses   268
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Guy L. Hovis, Alexandra Navrotsky
Enthalpies of mixing for disordered alkali feldspars at high temperature: A test of regular solution thermodynamic models and a comparison of hydrofluoric acid and lead borate solution calorimetric techniques   280
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Laurinda Chamberlin, John R. Beckett, Edward Stolper
Palladium oxide equilibration and the thermodynamic properties of MgAl₂O₄ spinel   285
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K.-U. Hess, D. B. Dingwell, S. L. Webb
The influence of excess alkalis on the viscosity of a haplogranitic melt   297
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Yan Bottinga, Pascal Richet, Anne Sipp
Viscosity regimes of homogeneous silicate melts   305
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Joseph D. Devine, James E. Gardner, Hans P. Brack, Graham D. Layne, Malcolm J. Rutherford
Comparison of microanalytical methods for estimating H₂O contents of silicic volcanic glasses   319
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Michael E. Fleet, Yuanming Pan
Site preference of rare earth elements in fluorapatite   329
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Roberto V. Santos, Robert N. Clayton
The carbonate content in high-temperature apatite: An analytical method applied to apatite from the Jacupiranga alkaline complex   336
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(Contents continued from front cover)

Carolyn Rose Rebbert, Elizabeth Partin, David A. Hewitt
Synthetic biotite oxidation under hydrothermal conditions   345
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Erin M. Walling, Peter A. Rock, William H. Casey
The Gibbs energy of formation of huntite, CaMg₃(CO₃)₄, at 298 K and 1 bar from electrochemical cell measurements   355
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Frank S. Spear, Matthew J. Kohn, Stephan Paetzold
Petrology of the regional sillimanite zone, west-central New Hampshire, U.S.A., with implications for the development of inverted isograds   361
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Daniel Nyfeler, Thomas Armbruster, Roger Dixon, Vladimir Bermanec
Nchwaningite, Mn²⁺₂SiO₃(OH)₂.H₂O, a new pyroxene-related chain silicate from the N'chwaning mine, Kalahari manganese field, South Africa   377
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Hong Zheng, Sturges W. Bailey
The crystal structure of manandonite-2H₂   387
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Franklin F. Foit, Jr., Paul D. Robinson, James R. Wilson
The crystal structure of gillulyite, Tl₂(As,Sb)₈S₁₃, from the Mercur gold deposit, Tooele County, Utah, U.S.A.   394
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Paola Bonazzi, Silvio Menchetti, Giovanni Pratesi
The crystal structure of pararealgar, As₄S₄   400
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NEW MINERAL NAMES    404

John L. Jambor, Jacek Puziewicz, Andrew C. Roberts
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MEMORIALS

S. Ross Taylor
Memorial of Louis H. Ahrens, 1918-1990   41O
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Kenzo Yagi
Memorial of Zyunpei Harada, 1898-1992   412
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BOOK REVIEWS    415

Robert C. Newton
GRANULITES AND CRUSTAL EVOLUTION. Edited by D. Vielzeufand Ph. Vidal. Kluwer Academic Publishers (NATO ASI Series C, vol. 311),1990, xvi + 585 pages.
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E. U. Petersen
METALLOGENY OF TIN, Lecture Notes in Earth Sciences 32. By Bernd Lehmann. Edited by Somdev Bhattacharji, Gerald M. Friedman, Horst J. Neugebauer, and Adolf Seilacher. Springer-Verlag, Berlin. 1990. 211 pages.
Full Text (200 K)