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X-ray study of the nature of stacking faults in the structure of glauconites

Published online by Cambridge University Press:  09 July 2018

B. A. Sakharov ,
G. Besson ,
V. A. Drits ,
M. Yu. Kameneva ,
A. L. Salyn  and
B. B. Smoliar
B. A. Sakharov
Affiliation:
Institute of Geology and Mineralogy, Acad. Sci. USSR, Moscow, USSR
G. Besson
Affiliation:
Laboratoire de Cristallographie, Université d’Orléans, B.P. 6759, 45067 Orléans Cedex 2, France
V. A. Drits
Affiliation:
Institute of Geology and Mineralogy, Acad. Sci. USSR, Moscow, USSR
M. Yu. Kameneva
Affiliation:
Institute of Geophysics and Geology, Acad. Sci. USSR, Novosibirsk, USSR
A. L. Salyn
Affiliation:
Institute of Geology and Mineralogy, Acad. Sci. USSR, Moscow, USSR
B. B. Smoliar
Affiliation:
Institute of Geology and Mineralogy, Acad. Sci. USSR, Moscow, USSR
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Abstract

Glauconites are dioctahedral, microdivided, Fe-containing silicates whose idealized structure may be described as a stacking of 2 : 1 layers with the same azimuthal orientation. The diffractometric and crystallochemical data do not coincide with this idealized structural model. For each glauconite studied the best fit between experimental and theoretical XRD patterns was obtained using the same model. It was possible to describe the stacking by an equally probable occurrence of layers rotated by multiples of 60°. The layer types alternate with a definite tendency to segregation. The model is characteristic for all glauconites, irrespective of composition, age and type of host rock. The alternation of layers rotated by 60° in the structure leads to both octahedral and prismatic coordination for the interlayer K+ cation.

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 4 , December 1990 , pp. 419 - 435
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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