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. 2017 Jun 7;8:15647. doi: 10.1038/ncomms15647

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Copyright © 2017, The Author(s)

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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Powder sample recovered from an experiment where starting α-cristobalite was cold-pressed to ca. 50 GPa and quenched to ambient conditions. (a,b) Bright field image showing isolated crystalline grains (dark grey) surrounded by amorphous matrix (light grey), with the rectangle in b marking the area selected for the HRTEM image shown in c. FFT (Fast Fourier Transform) diffraction pattern (d) derived from the area presented in c. The d-spacings obtained by FFT can be indexed as both α-cristobalite (black) and seifertite (red) in this particular direction. Due to high beam sensitivity, only one orientation of the specimen was acquired. The pattern seems to be more suitably indexed as α-cristobalite.