Riesite, a New High Pressure Polymorph of TiO₂ from the Ries Impact Structure

Creators: Tschauner, Oliver; Ma, Chi; Lanzirotti, Antonio; Newville, Matthew G.

Abstract

This paper describes riesite, a new high-pressure polymorph of TiO₂ from the Ries impact structure, Germany. Riesite occurs in shock-induced melt veins within xenoliths of bedrock in suevite. It is structurally closely related to srilankite from which it differs by having two distinct cation sites rather than one and through its monoclinic symmetry. It is indicative that riesite forms only upon release from the shock state upon back transformation from akaogiite.

Additional Information

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received: 14 December 2019; Accepted: 16 January 2020; Published: 18 January 2020. We would like to thank Robert C. Liebermann for his suggestion to submit this paper to the Special Issue of Minerals in memory of Orson Anderson. We also thank V. Stähle and D. Stöffler for providing the thinsection ZLN114c which contains type riesite and we thank the Institut für Geowissenschaften, University of Heidelberg and in particular M. Trieloff for permitting us to examine this section, which is part of their collection. The publication fees for this article were supported by the UNLV University Libraries Open Article Fund. This work was supported by DOE Award DESC0005278, NSF EAR-1128799, DE-FG02-94ER14466, NSF Grants EAR-0318518, and DMR-0080065. Portions of this work were performed at GeoSoilEnviroCARS (The University of Chicago, Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation – Earth Sciences (EAR – 1634415) and Department of Energy- GeoSciences (DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Author Contributions: O.T. collected X-ray diffraction and –fluorescence data, analyzed crystal structures, and contributed to the interpretation of data and writing of the manuscript, C.M. conducted chemical analysis, EBSD analysis, collected FE-SEM images, and contributed to the interpretation of data and writing of the manuscript, A.L. and M.G.N. set up experiment for X-ray diffraction and –fluorescence analysis, and contributed to the interpretation of data and writing of the manuscript. All authors have read and agree to the published version of the manuscript.

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