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American Mineralogist; October 2007; v. 92; no. 10; p. 1586-1592; DOI: 10.2138/am.2007.2410
© 2007 Mineralogical Society of America
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XRD and HRTEM analyses of stacking structures in sudoite, di-trioctahedral chlorite

Jun Kameda1,*, Ritsuro Miyawaki2, Ryuji Kitagawa3 and Toshihiro Kogure1

1 Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
2 Department of Geology, The National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku-ku, Tokyo, 169-0073, Japan
3 Deparment of Earth and Planetary System Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan

Correspondence: * E-mail: kameda{at}eps.s.u-tokyo.ac.jp

The stacking structures of sudoite, di-trioctahedral chlorite from two different localities are investigated by powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). XRD analyses using a Gandolfi camera revealed that the structures of both specimens are similar, corresponding to a one-layer IIbb-4 (1A) polytype. HRTEM observations indicate that the stacking sequence is characterized by a largely uniform intralayer shift of a/3 in the –X1 direction (Xi represent the directions along the pseudohexagonal axes) and by an interlayer displacement of similar magnitude in either the –X2 or –X3 direction. Stacking disorder is primarily caused by the mixing of interlayer displacements in the two directions. This disorder is more common in the lath-shaped crystalline specimen from Berezovsk, Russia than in the fine platy crystalline specimen from Ottré, Belgium. DIFFaX simulations of the powder XRD patterns for this stacking model reproduced the observed features well for both specimens. The stacking configuration of these sudoite specimens is considered to be controlled by the corrugation of basal oxygen planes in the 2:1 layer and the corresponding deformation in the brucite-like interlayer sheet.

Key Words: Crystal structure • sudoite • transmission electron microscopy • polytypism






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