¹Chi Ma,²Oliver Tschauner,¹John R. Beckett,¹George R. Rossman,³Clemens Prescher,³Vitali B. Prakapenka,⁴Hans A. Bechtel,⁴Alastair MacDowell
Meteoritics & Planetary Science (in Press) Link to Article [DOI: 10.1111/maps.13000]
¹Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
²High Pressure Science and Engineering Center and Department of Geoscience, University of Nevada, Las Vegas, Nevada, USA
³Center of Advanced Radiation Sources, GSECARS, The University of Chicago, Chicago, Illinois, USA
⁴Advanced Light Source, ESG, Lawrence Berkeley National Laboratory, Berkeley, California, USA
Published by arrangement with John Wiley & Sons

In this paper, we discuss the occurrence of liebermannite (IMA 2013-128), KAlSi3O8, a new, shock-generated, high-pressure tetragonal hollandite-type structure silicate mineral, in the Zagami basaltic shergottite meteorite. Liebermannite crystallizes in space group I4/m with Z = 2, cell dimensions of a = 9.15 ± 0.14 (1σ) Å, c = 2.74 ± 0.13 Å, and a cell volume of 229 ± 19 Å3 (for the type material), as revealed by synchrotron diffraction. In Zagami, liebermannite likely formed via solid-state transformation of primary igneous K-feldspar during an impact event that achieved pressures of ~20 GPa or more. The mineral name is in honor of Robert C. Liebermann, a high-pressure mineral physicist at Stony Brook University, New York, USA.