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Refinement of Mn-Substituted Muscovite and Phlogopite

Published online by Cambridge University Press:  02 April 2024

Rick A. Knurr and
S. W. Bailey
Rick A. Knurr
Affiliation:
Department of Geology and Geophysics, University of Wisconsin-Madison, Madison, Wisconsin 53706
S. W. Bailey
Affiliation:
Department of Geology and Geophysics, University of Wisconsin-Madison, Madison, Wisconsin 53706
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Abstract

The crystal structures of a reddish-purple, Mn-bearing muscovite-2M1 (alurgite variety) and a reddish-brown, Mn-bearing phlogopite-1M (manganophyllite variety) were refined to final residuals of 2.7% and 3.1%, respectively. The refinements were carried out in space groups C2/c and C1 for alurgite and C2/m and C2 for manganophyllite. The C1 and C2 subgroup refinements gave atomic coordinates consistent with the parent space group refinements. No cation ordering was found in either specimen, and the structures are very similar to those of muscovite and phlogopite. Residual areas of positive electron densities were found between the tetrahedral cations and neighboring oxygens in difference maps of both minerals. Those of alurgite were examined in detail to show the correlation between the residual densities and covalent bonding in the tetrahedra. The valence of the Fe present was determined by Mössbauer spectra as Fe3+ in both samples and of the Mn by optical spectra as Mn3+ in the alurgite but as Mn2+ in the manganophyllite.

Keywords

AlurgiteCrystal structureManganeseManganophylliteMuscovitePhlogopite

Information

Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 1 , February 1986, pp. 7 - 16
Copyright
Copyright © 1986, The Clay Minerals Society

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