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. 2019 Jun 17;10:2670. doi: 10.1038/s41467-019-10620-3

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Mineralogical composition of the <2 µm clay-size fractions. X-ray diffraction profiles of oriented preparations after air-drying (black lines) and glycolation (red lines) and their transmission-electron images are given. a Microbial mat specimen. b Large, well-crystallized lath from microbial mat laminae. The inset shows selected area electron diffraction (SAED) pattern. hk0 pattern shows a hexagonal structure typical of phyllosilicates and coherently stacked crystals. c Hexagonal habit of illite from a mat sample. d Associated sandstone sediment. e Lathlike and poorly crystallized particles from the host sandstone. f Tiny hexagonal-shaped particles from the host sediment. [Green areas correspond to long-range ordered illite–smectite mixed-layer minerals (R3 I/S MLM); Blue areas represent randomly ordered illite–smectite mixed-layer minerals (R0 I/S MLM); smectite (S); chlorite (Ch); mixed-layer (ML); illite/mica (I/M); anatase (An); quartz (Q); pyrite (Py); barite (Ba); calcite (Ca)]