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American Mineralogist; May-June; v. 93; no. 5-6; p. 796-799; DOI: 10.2138/am.2008.2538
© 2008 Mineralogical Society of America
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Rationale for the existence of four- and eight-reversals in antigorite

Gian Carlo Capitani1,* and Marcello Mellini2

1 Dipartimento Geomineralogico, Università di Bari, Via Orabona 4, 70125 Bari, Italy
2 Dipartimento di Scienze della Terra, Università di Siena, Via Laterina 8, 53100 Siena, Italy

Correspondence: * E-mail: g.capitani{at}geomin.uniba.it

The validity of the structural model of antigorite based on the occurrence of four- and eight-membered tetrahedral rings is confirmed. The quality of crystals, single-crystal X-ray and synchrotron diffraction, lattice geometry, HRTEM interpretations, and coordination chemistry still provide evidence in favor of these refined structures. The arguments used to invalidate this model and support an alternative one based on the occurrence of tetrahedral six-reversals only and octahedral sheet offsets do not hold.

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




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