Structural Factors Controlling Stacking Sequences in Dioctahedral Micas

Necip Güven
Department of Geology, University of Illinois, Urbana, III.61801, U.S.A.

Abstract: Deviations in the symmetry of mica single layers from the ideal arrangement with all atoms in hexagonal arrays are caused by the structural factors such as compositional variation (substitutions), order-disorder, and distortions. The derivative crystal structure theory as applied to mica polymorphism, implies that the ideal symmetry of the mica single layer (C2/m) can be altered to one of its standard subgroups by these structural factors. The “derivative structure” of the single layer may allow a unique interlayer and a specific intralayer configuration and result in a regular stacking sequence.

Clays and Clay Minerals; July 1971 v. 19; no. 3; p. 159-165; DOI: 10.1346/CCMN.1971.0190304
© 1971, The Clay Minerals Society
Clay Minerals Society (www.clays.org)