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. 2018 Jun 6;4(6):eaar3330. doi: 10.1126/sciadv.aar3330

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 3 — (A) Comparison of XRD patterns from Oudam, Marimba, Quela, and Sebina, with peaks assigned to clay minerals and other component minerals (A, anhydrite; B, bassanite; H, hematite; P, plagioclase). (B) Close-up comparison of Marimba, Quela, Sebina, and YKB XRD patterns with trioctahedral and dioctahedral smectite standards (SapCa-1 saponite and SAz-1 montmorillonite), showing the difference in 02l band position corresponding to a difference in octahedral occupancy. (C) BGMN model of the 02l band of Marimba showing contributions from trioctahedral and dioctahedral smectites.