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Substitution of ‘small’ divalent cations (e.g. Mg) for Si and Al in the nepheline tetrahedral framework: 1. Calculation of atomic formulae and stoichiometry parameters

Published online by Cambridge University Press:  16 March 2022

C. Michael B. Henderson Open the ORCID record for C. Michael B. Henderson [Opens in a new window]  and
Ítalo Lopes de Oliveira Open the ORCID record for Ítalo Lopes de Oliveira [Opens in a new window]
C. Michael B. Henderson*
Affiliation:
School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK Consultant, Science and Technology Funding Council, Daresbury Laboratory, Warrington WA4 4AD, UK
Ítalo Lopes de Oliveira
Affiliation:
Instituto de Geociências, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasília, DF, 70910-900, Brazil.
*
*Author for correspondence: C. Michael B. Henderson, Email: [email protected]
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Abstract

A recent review paper on nepheline solid solutions dealt mainly with sodic varieties from nepheline syenites and differentiated alkali basaltic sills. Excel spreadsheets were provided for recalculating cell formulae in terms of the stoichiometric parameters ΔAlcavity cation charge and ΔTframework charge and molecular percentages of the end-members Ne, Ks, Ca-nepheline and excess Si (Qxs). Small amounts of tetrahedral divalent species (usually <0.10 wt.% though with up to 0.33 wt.% MgO) were related to a stuffed-tridymite end-member of ideal formula K8Mg4Si12O32 (denoted KsT2+-nepheline), although the equations used to calculate these end-members only considered Si, Al and Fe3+ as tetrahedral framework species. Recently, K-rich nepheline and kalsilite which contain up 0.54 wt.% MgO have been found in some feldspar-free mafic potassic volcanic rocks from central Brazil. Equations have been developed to deal rigorously with the presence of significant amounts of Mg (and Mn) in recalculating nepheline solid-solution parameters. In two related communications reworked spreadsheets are provided with examples of their use. High quality microprobe analyses of nepheline and kalsilite from magmatic rocks must include analyses for Mg and Mn and, if possible, estimates of Fe2+ contents.

Keywords

nepheline stoichiometrytetrahedral T2+ cationsend-member calculationscoupled ΔAlcavity cation charge and ΔTframework charge parametersestimating Fe valenceexcel calculation spreadsheets
Type
Article
Information
Mineralogical Magazine , Volume 86 , Issue 2 , April 2022 , pp. 243 - 253
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: G. Diego Gatta

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