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. 2018 Aug 9;8:11947. doi: 10.1038/s41598-018-29853-1

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© The Author(s) 2018

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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Stishovite (100) and (110) surfaces: (a) stable cleaved (100) surface; (b,c) unstable cleaved (110) surface; (d,e) stable “dense stishovite” (110) reconstruction. Ball-and-stick and polyhedral representations are given. Blue and red balls are silicon and oxygen atoms. Purple atoms are interlayer oxygens. It is quite surprising that cleaved surface, without any reconstruction, is stable for stishovite (100) surface. The (110) surface of stishovite reconstructs dramatically, and with the bulk structure recovering only in the third polyhedral layer; the second layer being similar to the first layer of the cleaved (110) surface.