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Quantitative mineralogical analysis of Spanish roofing slates using the Rietveld method and X-ray powder diffraction data

Colin R. Ward and Fernando Goemez-Fernandez
Quantitative mineralogical analysis of Spanish roofing slates using the Rietveld method and X-ray powder diffraction data
European Journal of Mineralogy (December 2003) 15 (6): 1051-1062

Abstract

The relative proportions of the minerals in a series of slates from the Iberian Massif in northwestern Spain, quarried and used for roofing purposes, have been evaluated using X-ray powder diffraction and the Rietveld-based SIROQUANT data processing system. Information on the chemical composition of the chlorite, mica and feldspar in the slates was obtained separately from electron microprobe studies, and was used in conjunction with the mineral proportions to calculate an inferred chemical composition for each sample from the quantitative XRD data. The inferred compositions were then compared to the actual chemical compositions of the respective slate samples, obtained by X-ray fluorescence spectrometry, to evaluate the consistency between the XRD results and independent chemical analysis data. A high level of consistency was observed between the element oxide percentages inferred from the XRD study and the equivalent oxide proportions determined by direct chemical analysis. The comparison suggests that Rietveld-based interpretation of X-ray powder diffraction data provides results that are consistent with other compositional parameters. Although no particular relationships were observed among the individual mineral percentages in the slates of the sample suite, a well-defined inverse relationship was found between the percentages of quartz plus feldspar on the one hand and the percentages of mica plus chlorite on the other. This may reflect variations in the relative proportions of coarse- and fine-grained sediment in the original parent materials that formed the slate deposits.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 6
Title: Quantitative mineralogical analysis of Spanish roofing slates using the Rietveld method and X-ray powder diffraction data
Affiliation: University of New South Wales, School of Biological, Earth and Environmental Sciences, Sydney, N.S.W., Australia
Pages: 1051-1062
Published: 200312
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 44
Accession Number: 2004-026351
Categories: General mineralogyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, sketch map
N37°00'00" - N43°45'00", W09°00'00" - E00°00'00"
N36°00'00" - N43°45'00", W09°30'00" - E04°30'00"
Secondary Affiliation: Universidad de Leon, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200408
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