The Clay Minerals Society

Clays and Clay Minerals¨

Volume 44 Number 4 August 1996

Contents

Vicinal Faces on Synthetic Goethite Observed by Atomic Force Microscopy
P. G. Weidler, T. Schwinn, and H. E. Gaub 437

Relation Between Interlayer Composition of Authigenic Smectite, Mineral Assemblages, I/S Reaction Rate and Fluid Composition in Silicic Ash of the Nankai Trough
Harue Masuda, James R. O’Neil, Wei-Teh Jiang, and Donald R. Peacor 443

Change in Layer Charge of Smectites and Smectite Layers in Illite/Smectite During Diagenetic Alteration
Tsutomu Sato, Takashi Murakami, and Takashi Watanabe 460

Transition Metals in Llano Vermiculite Samples: An EPR Study
P. M. Schosseler and A. U. Gehring 470

Potential-Distance Relationships of Clay-Water Systems Considering the Stern Theory
A. Sridharan and P. V. Satyamurty 479

Size and Shape of Allophane Particles in Dispersed Aqueous Systems
Jutaro Karube, Katsuya Nakaishi, Hideo Sugimoto, and Masami Fujihira 485

TEM and X-Ray Diffraction Evidence for Cristobalite and Tridymite Stacking Sequences in Opal
Jessica M. Elzea and Stephen B. Rice 492

Intercalation of N-Alkyltrimethylammonium into Swelling Fluoro-Mica
Kenji Tamura and Hiromoto Nakazawa 501

Polyvinyl Alcohol-Clay Complexes Formed by Direct Synthesis
Kathleen A. Carrado, P. Thiyagarajan, and Delwin L. Elder 506

Electrodes Modified with Synthetic Clay Minerals: Electrochemistry of Cobalt Smectites
Yan Xiang and Gilles Villemure 515

Reduction of Structural Fe(III) in Smectite by a Pure Culture of the Shewanella Putrefaciens Strain MR-1
Joel E. Kostka, Joseph W. Stucki, Kenneth H. Nealson and Jun Wu 522

Geologic Control of Severe Expansive Clay Damage to a Subdivision in the Pierre Shale, Southwest Denver Metropolitan Area, Colorado
J. D. Gill, M. W. West, D. C. Noe, H. W. Olsen, and D. K. McCarty 530

Refinement of the Structure of Natural Ferriphlogopite
Maria Franca Brigatti, Luca Medici, and Luciano Poppi 540

Mechanism and Conditions of Clay Formation During Natural Weathering of MSWI Bottom Ash
C. Zevenbergen, L. P. Van Reeuwijk, J. P. Bradley. P. Bloemen and R. N. J. Comans 546

Model for Crystalline Swelling of 2:1 Phyllosilicates
David A. Laird 553

Notes

The Thermodynamic Status of Compositionally-Complex Clay Materials: Discussion of "Clay Mineral Thermometry—A Critical Perspective"
Stephen U. Aja and Philip E. Rosenburg 560

Determination of the Chemical Composition of Natural Illites by Analytical Electron Microscopy
Philip E. Rosenberg and Robert L. Hooper 569