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Published online 18 March 2009
Mineralogical Magazine; October 2008; v. 72; no. 5; p. 1021-1034; DOI: 10.1180/minmag.2008.072.5.1021
© 2009 Mineralogical Society of Great Britain and Ireland
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TOURCOMP: A program for estimating end-member proportions in tourmalines

A. Pesquera1,*, F. Torres2, P. Gil-Crespo1 and J. Torres-Ruiz3

1 Departamento de Mineralogía-Petrología, Universidad del País Vasco P.O. Box 644, 48080 Bilbao, Spain
2 Departamento de Estadística e Investigación Operativa, Universidad de Granada, Campus Fuentenueva, s/n, E-18002 Granada, Spain
3 Departamento de Mineralogía-Petrología, Universidad de Granada, Campus Fuentenueva, s/n, E-18002 Granada, Spain

* E-mail: alfonso.pesquera{at}ehu.es

A Visual Basic program (TOURCOMP) has been written to recast the tourmaline composition into end-member components from electron microprobe data or more complete tourmaline analyses. TOURCOMP is a program based on a linear algebraic model that directly calculates the end-member proportions of tourmalines from their structural formulae. The program is developed for IBM-compatible personal computers running under the WindowsTM operating system. The source code has been also translated and compiled in order to run on an Apple computer. Analytical problems, uncertainties concerning site occupancies, and the normalization procedure to determine the structural formula are the main error sources. However, the method of recalculating tourmaline end-members presented in this paper is considered to provide reasonably good results, bearing in mind the chemical complexity of tourmaline.

KEYWORDS: tourmaline chemistry, tourmaline end-members calculation, Visual Basic program






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Mineralogical Society of Great Britain and Ireland