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Quantifying the A-site occupancy in amphiboles; a Raman study in the OH-stretching region

Marco Sbroscia, Giancarlo Della Ventura, Gianluca Iezzi and Armida Sodo
Quantifying the A-site occupancy in amphiboles; a Raman study in the OH-stretching region
European Journal of Mineralogy (May 2018) 30 (3): 429-436

Abstract

The amphibole group of minerals comprises a large number of species, some of which have typically fibrous shapes and are thus of interest for environmental hazard issues. Their identification is complicated by the presence of light elements (H and Li), multi-valence elements (e.g. Fe, Mn) and a partially vacant structural site. Vibrational spectroscopies are valuable tools to address the quantitative determination of occupancies in amphiboles: however, whilst Fourier-Transform Infra-Red Spectroscopy (FTIR) has been preferentially used in crystal-chemical studies, Raman spectroscopy has been restricted to asbestos identification. In this work we focus our attention on two sets of well-characterised synthetic amphiboles, i.e. on samples along the potassium-richterite - tremolite join, and the Na(NaMg)Mg (sub 5) Si (sub 8) O (sub 22) (OH) (sub 2) compound synthesised at different T and P conditions. We show that the Raman spectra in the OH-stretching region are very similar, in terms of band shape and multiplicity to the FTIR spectra; however, the relative intensity of the Raman peaks provides direct quantitative information on the A-site occupancy, a feature that has significant implications as a tool for asbestos studies.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 30
Serial Issue: 3
Title: Quantifying the A-site occupancy in amphiboles; a Raman study in the OH-stretching region
Affiliation: Universita di Roma Tre, Dipartimento di Scienze, Rome, Italy
Pages: 429-436
Published: 201805
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 49
Accession Number: 2018-088866
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Universita G. d'Annunzio, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201848
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