Articles | Volume 35, issue 2
Research article
06 Apr 2023
Research article |  | 06 Apr 2023

Optimal Raman-scattering signal for estimating the Fe3+ content on the clinozoisite–epidote join

Mariko Nagashima and Boriana Mihailova

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Cited articles

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Andò, S. and Garzanti, E.: Raman spectroscopy in heavy-mineral studies, in: Sediment provenance studies in hydrocarbon exploration and production, edited by: Scott, R. A., Morton, A. C., and Richardson, N., Geol. Soc. London, Spec. Publ., 386, 395–412,, 2014. 
Armbruster, T., Bonazzi, P., Akasaka, M., Bermanec, V., Chopin, C., Heuss-Assbischler, S., Liebscher, A., Menchetti. S., Pan, Y., and Pasero, M.: Recommended nomenclature of epidote-group minerals, Eur. J. Miner., 18, 551–567,, 2006. 
Armbruster, T., Gnos, E., Dixon, R., Gurzmer, J., Hejny, C., Döbelin, N., and Medenbach, O.: Manganvesuvianite and tweddillite, two new minerals from the Kalahari manganese fields, South Africa. Miner. Mag., 66, 137–150,, 2002. 
Aspiotis, S., Schlüter, J., and Mihailova, B., Non-destructive determination of the biotite crystal chemistry using Raman spectroscopy: how far we can go?, Eur. J. Miner., 34, 573–590,, 2022. 
Short summary
We provide a tool for fast preparation-free estimation of the Fe3+ content in Al–Fe3+ series epidotes by Raman spectroscopy. The peaks near 570, 600, and 1090 cm−1, originating from Si2O7 vibrations, strongly correlated with Fe content, and all three signals are well resolved in a random orientation. Among them, the 570 cm−1 peak is the sharpest and easily recognized. Hence, the linear trend, ω570 = 577.1(3) − 12.7(4)x, gives highly reliable Fe content, x, with accuracy ± 0.04 Fe3+ apfu.