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

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The amphibole group of minerals comprises a large number of species, some of which have typicallyfibrous shapes and are thus of interest for environmental hazard issues. Their identification is complicated by the presence of light elements (H and Li), multivalence 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)Mg5 Si8 O22 (OH)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.
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Keywords: A -SITE OCCUPANCY; MAGNESIUM-RICHTERITE; POTASSIUM-RICHTERITE; SYNTHETIC AMPHIBOLES; TREMOLITE; VIBRATIONAL SPECTROSCOPY (RAMAN, FTIR)

Document Type: Research Article

Publication date: June 1, 2018

This article was made available online on June 22, 2018 as a Fast Track article with title: "Quantifying the A-site occupancy in amphiboles: a Raman study in the OH-stretching region".

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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