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)Mg5Si8O22(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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Research Article|May 01, 2018
Quantifying the A-site occupancy in amphiboles: a Raman study in the OH-stretching region
Marco Sbroscia
Marco Sbroscia
1Dipartimento di Scienze, Università di Roma Tre, Viale Marconi 446, 00146Rome, Italy
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Giancarlo Della Ventura
Giancarlo Della Ventura
1Dipartimento di Scienze, Università di Roma Tre, Viale Marconi 446, 00146Rome, Italy2INFN-LNF, Via Enrico Fermi 40, Frascati, Rome, Italy
Corresponding author, e-mail: giancarlo.dellaventura@uniroma3.it
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Gianluca Iezzi
Gianluca Iezzi
3Dipartimento di Ingegneria & Geologia, Università G. d'Annunzio, Via Dei Vestini 30, 66013Chieti, Italy
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Armida Sodo
Armida Sodo
1Dipartimento di Scienze, Università di Roma Tre, Viale Marconi 446, 00146Rome, Italy
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European Journal of Mineralogy (2018) 30 (3): 429-436.
Article history
received:
30 Jun 2017
rev-recd:
20 Sep 2017
accepted:
02 Oct 2017
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CiteCitation
Marco Sbroscia, Giancarlo Della Ventura, Gianluca Iezzi, Armida Sodo; Quantifying the A-site occupancy in amphiboles: a Raman study in the OH-stretching region. European Journal of Mineralogy ; 30 (3): 429–436. doi: https://doi.org/10.1127/ejm/2018/0030-2727
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