Liebermannite,KAlSi3O8, a new shock-metamorphic,high-pressure mineral from the Zagami Martian meteorite |
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| Authors: | Chi Ma Oliver Tschauner John R Beckett George R Rossman Clemens Prescher Vitali B Prakapenka Hans A Bechtel Alastair MacDowell |
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| Institution: | 1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, 91125 USA;2. High Pressure Science and Engineering Center and Department of Geoscience, University of Nevada, Las Vegas, Nevada, 89154 USA;3. Center of Advanced Radiation Sources, GSECARS, The University of Chicago, Chicago, Illinois, 60632 USA;4. Advanced Light Source, ESG, Lawrence Berkeley National Laboratory, Berkeley, California, 94720 USA |
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| Abstract: | 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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