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Formation of laths in fine-grained micas and its relationship to stacking mechanism

Published online by Cambridge University Press:  05 July 2018

N. Güven
N. Güven*
Affiliation:
Department of Geosciences, Texas Tech. University, P.O. Box 4Io9, Lubbock, Texas 794o9, U.S.A.
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Summary

Transmission electron images of fine-grained micas from various clay deposits exhibit lath-shaped units arranged in modes similar to the stacking of layers in different mica polymorphs. Micas in a Georgia bentonite display two sets of parallel laths intersecting at an angle of 120°. Selected area electron diffraction (SAD) of these micas gives a sharp spot pattern indicating a perfect registry between the lattices of individual laths. Furthermore, the SAD pattern has an intensity distribution similar to that of a 2M1 dioctahedral mica. Another mica in an India bentonite shows one set of parallel laths with an intensity distribution expected from a IM biotite. Some of the micas in the Marblehead illite exhibit three sets of parallel laths in a trigonal arrangement similar to the stacking in 3T mica.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 307 , September 1974 , pp. 788 - 792
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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