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Chemical composition and physical properties of lithium-iron micas from the Krušné hory (Erzgebirge), Czechoslovakia and Germany. Part B: Cell parameters and optical data

Published online by Cambridge University Press:  05 July 2018

M. Rieder ,
A. Píchová ,
M. Fassová ,
E. Fediuková  and
P. Černý
M. Rieder
Affiliation:
Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland
A. Píchová
Affiliation:
Geological Survey of Czechoslovakia, Praha
M. Fassová
Affiliation:
Geological Survey of Czechoslovakia, Praha
E. Fediuková
Affiliation:
Geological Survey of Czechoslovakia, Praha
P. Černý
Affiliation:
Geological Institute, Czechoslovak Academy of Sciences, Praha
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Summary

Unit-cell dimensions and refractive indices of lithium-iron micas decrease with decreasing iron and increasing lithium. Indices β and γ as well as parameters a and b can be used to estimate the composition of lithium-iron micas but basal spacing and 2Vα are poor indicators of composition.

The chemical composition of natural lithium-iron micas from the Krušné hory and the Erzgebirge along the Czechoslovak—German border was discussed in Part A of this study (Rieder et al., 1970). It was concluded that the composition and crystallography of these micas fit best the series siderophyllite-polylithionite. The compositions were expressed by the ratio A′ = LR/(LR+‘Fe’). In this expression, LR is the subscript value of Li or octahedral R3+ (whichever is the smaller) in the crystallochemical formula, ‘Fe’ is the sum of the values in the formula of Fe2+ and Mn2+. A′ therefore defines the position of a particular mica on the siderophyllite-polylithionite join. This paper deals with the correlation between composition, cell dimensions, and refractive indices.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 294 , June 1971 , pp. 190 - 196
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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Footnotes

1

Present address: Ústav geologických věd University Karlovy, Albertov 6, Praha 2, Czechoslovakia.

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