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Appraisal of the Ferguson method and the linear model using Δ(bc), Δ(b*c*), Δ(αγ), Δ(α*γ*) to estimate tetrahedral Al-contents in alkali feldspar

Published online by Cambridge University Press:  05 July 2018

Achille Blasi
Achille Blasi*
Affiliation:
Istituto di Mineralogia, Petrografia e Geochimica, Università degli Studi, Via Botticelli 23, 20133 Milano, Italy
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Abstract

The new method proposed by Ferguson (1980, 1981) for estimating the T-site occupancies in K-rich feldspars from lattice constants is discussed and compared with the linear model using the structural indicators Δ(bc), Δ(b*c*), Δ(αγ), Δ(α*γ*). The latter method appears to be considerably more effective in view of its wider application to alkali feldspars of different compositions and structural states. Ferguson's (1980, 1981) method has been conceived for K-rich feldspars alone and may produce results that tend to be more erroneous the further a K-rich feldspar lies from the two-step ordering paths involved in the formulation of the determinative procedure itself.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 341 , December 1982 , pp. 465 - 468
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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