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. 2020 Dec 3;10:21196. doi: 10.1038/s41598-020-78240-2

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Raman spectra of the minerals identified in the Icelandic hydrothermal regimes; hot spring biofilms (MATs; green), mud pots (MPs; brown), active fumaroles (AFs; blue), and inactive fumaroles (IFs; grey). At the bottom, Raman spectra of minerals from the RRUFF database are shown in black for comparison and initial mineral identification. The spectrum of MAT-54 corresponds to carotenoids, according to Gall et al.⁷³. Different Raman spectra profiles depending on the spot measured in IF-20 and IF-49 are caused by mineral heterogeneities.