Liebermannite, KAlSi3O8, a new shock-metamorphic, high-pressure mineral from the Zagami Martian meteorite

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.


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