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Xieite, a new mineral of high-pressure FeCr2O4 polymorph

  • Articles/Geology
  • Published:
Chinese Science Bulletin

Abstract

Xieite, a new mineral, occurs in the shock vein of the Suizhou meteorite. The mineral has an orthorhombic structure and its space group is Bbmm. The cell parameters are a = 9.462(6) Å, b = 9.562(9) Å, c = 2.916(1)Å. The crystal-chemical formula is (Fe0.87Mg0.13Mn0.01)1.01(Cr1.62Al0.25Ti0.08V0.02)1.97O4, or simply formula FeCr2O4. Stronger X-ray diffraction lines are [d (Å), lll o]: (2.675, 100), (2.389, 20), (2.089, 10), (1.953, 90), (1.566, 60), (1.439, 15), (1.425, 15), (1.337, 40). Xieite is a high pressure polymorph of FeCr2O4 and formed by solid-state transformation of chromite under shock-induced high pressure and temperature, in association with other high-pressure minerals including ringwoodite, majorite, lingunite and tuite. The P-T condition for the formation of xieite is estimated to be 18–23 GPa and 1800–1950°C, respectively. Xieite has recently been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2007-056). The mineral name, xieite, is named after Xiande Xie.

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Authors and Affiliations

  1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Ming Chen

  2. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC, 20015, USA

    JinFu Shu & Ho-kwang Mao

Authors
  1. Ming Chen
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  2. JinFu Shu
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  3. Ho-kwang Mao
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Correspondence to Ming Chen.

Additional information

Supported by National Natural Science Foundation of China (Grant Nos. 40672035 and 40272028), and the Chinese Academy of Sciences (Grant No. KJCX2-SW-N20)

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Chen, M., Shu, J. & Mao, Hk. Xieite, a new mineral of high-pressure FeCr2O4 polymorph. Chin. Sci. Bull. 53, 3341–3345 (2008). https://doi.org/10.1007/s11434-008-0407-1

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  • DOI: https://doi.org/10.1007/s11434-008-0407-1

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