Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Dódony, I. Articles by Buseck, P. R. Search for Related Content GeoRef GeoRef Citation

Does antigorite really contain 4- and 8-membered rings of tetrahedra?

¹ Departments of Geological Sciences and Chemistry/Biochemistry, Arizona State University, Tempe, Arizona 85287, U.S.A.
² Department of Earth and Environmental Sciences, Pannon University, Veszprém, POB 158, H-8200 Hungary

Recent studies of the structure of antigorite by Capitani and Mellini (2004, 2005) and by us (Dódony et al. 2002; Dódony and Buseck 2004a) produced contradictory results. The main point of contention is whether 4- and 8-membered rings of tetrahedra occur at the positions where the tetrahedra in the tetrahedral sheets reverse their orientation. We analyzed electron diffraction patterns and transmission electron microscopy images in the paper of Capitani and Mellini (2005) and found no evidence for 4- and 8-membered rings of tetrahedra. On the contrary, we show that their TEM data confirm our antigorite model (Dódony et al. 2002) for the m = 16 structure. The significance of this debate goes beyond the subtleties of the structure of antigorite and highlights ambiguities in interpretation of HRTEM images as well as problems that can arise during image processing.

Key Words: Serpentine • antigorite • crystal structure • HRTEM • electron diffraction • image processing

This article has been cited by other articles:

				G. C. Capitani, L. Stixrude, and M. Mellini First-principles energetics and structural relaxation of antigorite American Mineralogist, August 1, 2009; 94(8-9): 1271 - 1278. [Abstract] [Full Text] [PDF]

				G. C. Capitani and M. Mellini Rationale for the existence of four- and eight-reversals in antigorite American Mineralogist, May 1, 2008; 93(5-6): 796 - 799. [Abstract] [Full Text] [PDF]