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TOURCOMP: A program for estimating end-member proportions in tourmalines

Published online by Cambridge University Press:  05 July 2018

A. Pesquera ,
F. Torres ,
P. Gil-Crespo  and
J. Torres-Ruiz
A. Pesquera*
Affiliation:
Departamento de Mineralogía-Petrología, Universidad del País Vasco P.O. Box 644, 48080 Bilbao, Spain
F. Torres
Affiliation:
Departamento de Estadística e Investigaciόn Operativa, Universidad de Granada, Campus Fuentenueva, s/n, E-18002 Granada, Spain
P. Gil-Crespo
Affiliation:
Departamento de Mineralogía-Petrología, Universidad del País Vasco P.O. Box 644, 48080 Bilbao, Spain
J. Torres-Ruiz
Affiliation:
Departamento de Mineralogía-Petrología, Universidad de Granada, Campus Fuentenueva, s/n, E-18002 Granada, Spain
*
*E-mail: alfonso.pesquera@ehu.es
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Abstract

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 Windows™ 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 chemistrytourmaline end-members calculationVisual Basic program
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 5 , October 2008 , pp. 1021 - 1034
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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