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Vestaite, (Ti4+Fe2+) Ti34+ O9, a new mineral in the shocked eucrite Northwest Africa 8003

  • Run-Lian Pang , Dennis Harries , Kilian Pollok , Ai-Cheng Zhang EMAIL logo and Falko Langenhorst
Published/Copyright: August 28, 2018
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American Mineralogist
From the journal American Mineralogist Volume 103 Issue 9

Abstract

Our investigations on the shocked eucrite Northwest Africa (NWA) 8003 revealed the occurrence of a new mineral, vestaite [IMA 2017-068; (Ti4+Fe2+) Ti34+ O9], This mineral coexists with corundum, ilmenite, and Al-Ti-rich pyroxene in shock melt pockets. It has an empirical chemical formula of ( Ti0.734+Fe0.632+ Al0.60Mn0.03Mg0.02Cr0.01) Ti34+ O9 and the monoclinic C2/c structure of schreyerite. The ideal vestaite structure can be considered as a modular structure with an alternate intergrowth of M3O5-type (M = Ti4+,Fe2+,Al) and Ti2O4-type slabs. Alternatively, it can also be envisaged as a crystallographic shear structure with periodically shearing of rutile or α-PbO2 units. Streaking and splitting of diffraction spots observed in selected-area electron diffraction patterns indicate planar defects in the modular structure of vestaite. Our observations reveal that vestaite crystallized at high pressure (≤10 GPa) from a melt that represents a mixture of ilmenite and silicate components. A robust constraint on its formation conditions and stability field cannot yet be provided due to the lack of experimental data for these systems. Vestaite is a new, shock-generated mineral first found in a meteorite of the howardite- eucrite-diogenite (HED) clan, the largest achondrite group. Its discovery is not only of significance to the meteoritic mineralogy, but it could also be of interest to materials science.

Keywords: Vestaite; new mineral; Northwest Africa 8003; HED meteorites; shock metamorphism

Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant 41673068), the Natural Science Foundation of Jiangsu Province of China (Grant BK20170017), and the Gottfried Wilhelm Leibniz program of the Deutsche Forschungsgemeinschaft (LA830/14-1). Li-Xin Gu, Agnese Fazio, and Jia-Ni Chen are appreciated for their technical assistance in preparing FIB foils, SEM, and TEM observations. The first author is also grateful to the China Scholarship Council for a 2 year Ph.D. grant and to the group of Analytical Mineralogy of Micro- and Nanostructures, Friedrich Schiller University Jena for hosting her during this period. We thank Chi Ma and Erin Walton for their helpful reviews that improved the quality of the paper, and associate editor Steve Simon for his comments and editorial handling.

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Received: 2018-02-23
Accepted: 2018-05-25
Published Online: 2018-08-28
Published in Print: 2018-09-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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  2. The tales of disequilibrium and equilibrium crystallization of rare metal minerals: Data from new experiments
  3. Pressure, temperature, water content, and oxygen fugacity dependence of the Mg grain-boundary diffusion coefficient in forsterite
  4. Questioning the biogenicity of Neoproterozoic superheavy pyrite by SIMS
  5. The effect of disequilibrium crystallization on Nb-Ta fractionation in pegmatites: Constraints from crystallization experiments of tantalite-tapiolite
  6. Titanite major and trace element compositions as petrogenetic and metallogenic indicators of Mo ore deposits: Examples from four granite plutons in the southern Yidun arc, SW China
  7. Kuliginite, a new hydroxychloride mineral from the Udachnaya kimberlite pipe, Yakutia: Implications for low-temperature hydrothermal alteration of the kimberlites
  8. Electron microprobe technique for the determination of iron oxidation state in silicate glasses
  9. Experimental investigation of F and Cl partitioning between apatite and Fe-rich basaltic melt at 0 GPa and 950–1050 °C: Evidence for steric controls on apatite-melt exchange equilibria in OH-poor apatite
  10. Carbonic acid monohydrate
  11. High spatial resolution analysis of the iron oxidation state in silicate glasses using the electron probe
  12. Disturbance of the Sm-Nd isotopic system by metasomatic alteration: A case study of fluorapatite from the Sin Quyen Cu-LREE-Au deposit, Vietnam
  13. Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile
  14. Vestaite, (Ti4+Fe2+) Ti34+ O9, a new mineral in the shocked eucrite Northwest Africa 8003
  15. Decomposition boundary from high-pressure clinoenstatite to wadsleyite + stishovite in MgSiO3
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https://doi.org/10.2138/am-2018-6522
Keywords for this article
Vestaite; new mineral; Northwest Africa 8003; HED meteorites; shock metamorphism

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. The tales of disequilibrium and equilibrium crystallization of rare metal minerals: Data from new experiments
  3. Pressure, temperature, water content, and oxygen fugacity dependence of the Mg grain-boundary diffusion coefficient in forsterite
  4. Questioning the biogenicity of Neoproterozoic superheavy pyrite by SIMS
  5. The effect of disequilibrium crystallization on Nb-Ta fractionation in pegmatites: Constraints from crystallization experiments of tantalite-tapiolite
  6. Titanite major and trace element compositions as petrogenetic and metallogenic indicators of Mo ore deposits: Examples from four granite plutons in the southern Yidun arc, SW China
  7. Kuliginite, a new hydroxychloride mineral from the Udachnaya kimberlite pipe, Yakutia: Implications for low-temperature hydrothermal alteration of the kimberlites
  8. Electron microprobe technique for the determination of iron oxidation state in silicate glasses
  9. Experimental investigation of F and Cl partitioning between apatite and Fe-rich basaltic melt at 0 GPa and 950–1050 °C: Evidence for steric controls on apatite-melt exchange equilibria in OH-poor apatite
  10. Carbonic acid monohydrate
  11. High spatial resolution analysis of the iron oxidation state in silicate glasses using the electron probe
  12. Disturbance of the Sm-Nd isotopic system by metasomatic alteration: A case study of fluorapatite from the Sin Quyen Cu-LREE-Au deposit, Vietnam
  13. Segerstromite, Ca3(As5+O4)2[As3+(OH)3]2, the first mineral containing As3+(OH)3, the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile
  14. Vestaite, (Ti4+Fe2+) Ti34+ O9, a new mineral in the shocked eucrite Northwest Africa 8003
  15. Decomposition boundary from high-pressure clinoenstatite to wadsleyite + stishovite in MgSiO3
  16. Letter
  17. Making tissintite: Mimicking meteorites in the multi-anvil
  18. Book Review
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