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Cation ordering in lepidolite and biotite studied by X-ray photoelectron diffraction

Published online by Cambridge University Press:  09 July 2018

L. A. Ash ,
S. Evans  and
A. G. Hiorns
L. A. Ash
Affiliation:
Edward Davies Chemical Laboratories, University College of Wales, Aberystwyth, Dyfed SY23 INE
S. Evans
Affiliation:
Edward Davies Chemical Laboratories, University College of Wales, Aberystwyth, Dyfed SY23 INE
A. G. Hiorns
Affiliation:
Edward Davies Chemical Laboratories, University College of Wales, Aberystwyth, Dyfed SY23 INE
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Abstract

Comprehensive X-ray photoelectron diffraction (XPD) studies have revealed octahedral cation ordering in a 1M lepidolite and in a 1M biotite. In the lepidolite (from Høydaler, Telemark, Norway), all three octahedral sites are differentiated, with Li and Mn concentrated in the trans M(1) site and Al in cis M(3); M(2) contains all three cations. In the biotite, the major cations do not order but Ti, present at only 1·2% concentration, preferentially occupies the two cis sites, information which is available uniquely from XPD. Long-range tetrahedral ordering should be detectable by XPD, but was not found in either mica.

Type
Research Article
Information
Clay Minerals , Volume 22 , Issue 4 , December 1987 , pp. 375 - 386
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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References

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