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An X-ray determinative method for the divalent cation ratio in the triphylite-lithiophilite series

Published online by Cambridge University Press:  05 July 2018

Andrié-Mathieu Fransolet ,
Diano Antenucci ,
Jean-Marie Speetjens  and
Pierre Tarte
Andrié-Mathieu Fransolet
Affiliation:
Institut de Minéralogie, Université de Liège, 9 Place du Vingt-Août, B-4000 Liége, Belgium
Diano Antenucci
Affiliation:
Institut de Minéralogie, Université de Liège, 9 Place du Vingt-Août, B-4000 Liége, Belgium
Jean-Marie Speetjens
Affiliation:
Institut de Minéralogie, Université de Liège, 9 Place du Vingt-Août, B-4000 Liége, Belgium
Pierre Tarte
Affiliation:
Départment de Chimie Générale, Université de Liège, Sart Tilman, B-4000 Liège, Belgium
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Abstract

The powder diffractograms of twenty wet chemically analysed samples in the isomorphous triphylite-lithiophilite series and five synthesized members with Fe/(Fe + Mn) = 1, 0.75, 0.50, 0.25, and 0.0, were recorded. Their unit cell dimensions were accurately refined in order to find a reliable method for semi-quantitative determination of the divalent cation content of these minerals. A multivariate best fit analysis based on Kummell’s procedure shows the marked influence of Fe2+ and Mg2+ on the cell dimensions, as well as that of small amounts of Fe3+ substituting for Mn2+, following LiMn2+ → □ Fe3+. The best representation of the correlation between chemical composition and cell parameters is given by the equations:

a = 6.1041 − 0.0245 Fetot − 0.049 Mg2+

b = 10.4511 − Fetot − 0.082 Mg2+

c = 4.7400 − 0.0130(Fe2+ + Mg2+) − 0.025 Fe3+.

No evidence of non-linearity has been found for the variation of the three cell dimensions with the chemical composition. Assuming the absence of appreciable amounts of Mg2+, the following set of equations is proposed: Fetot = 41(6.104–a); Fetot = 35(10.451–b); Fetot = 77(4.740–c) in which the c dimension gives a relatively poor estimate.

Two sets of determinative graphs were constructed, one based on the cell parameter variation, and the other on the 311, 222, and 142 reflection angular positions, v. the total iron content of these minerals. These two methods, whose reliability is examined, can be used for determination of the divalent cation content, provided the samples contain less than about 0.5 wt.% Na2O, 0.5 wt.% CaO, and 3 wt. % Fe2O3, and are homogeneous.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 348 , September 1984 , pp. 373 - 381
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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Footnotes

*

Research Associate FNRS, Belgium.

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