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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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1945-3027
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Volume 95, Issue 2-3

Issues

Brownleeite: A new manganese silicide mineral in an interplanetary dust particle

Keiko Nakamura-Messenger
  • Astromaterials Research and Exploration Science Directorate, NASA, Johnson Space Center, Houston, Texas 77058, U.S.A.
  • ESCG/Jacobs Technology, Houston, Texas 77058, U.S.A.
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/ Lindsay P. Keller
  • Astromaterials Research and Exploration Science Directorate, NASA, Johnson Space Center, Houston, Texas 77058, U.S.A.
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/ Simon J. Clemett
  • Astromaterials Research and Exploration Science Directorate, NASA, Johnson Space Center, Houston, Texas 77058, U.S.A.
  • ESCG/ERC Inc., Houston, Texas 77058, U.S.A.
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/ Scott Messenger
  • Astromaterials Research and Exploration Science Directorate, NASA, Johnson Space Center, Houston, Texas 77058, U.S.A.
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/ John H. Jones
  • Astromaterials Research and Exploration Science Directorate, NASA, Johnson Space Center, Houston, Texas 77058, U.S.A.
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/ Russell L. Palma
  • Department of Physics and Astronomy, Minnesota State University, Mankato, Minnesota 56001, U.S.A.
  • Department of Physics, University of Minnesota, Minneapolis, Minnesota 55455, U.S.A.
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/ Robert O. Pepin / Wolfgang Klöck / Michael E. Zolensky
  • Astromaterials Research and Exploration Science Directorate, NASA, Johnson Space Center, Houston, Texas 77058, U.S.A.
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/ Hirokazu Tatsuoka
Published Online: 2015-04-02 | DOI: https://doi.org/10.2138/am.2010.3263

Abstract

Brownleeite, ideally stoichiometric MnSi, is a manganese silicide not previously observed in nature that was discovered within an interplanetary dust particle that likely originated from a comet. Three submicrometer brownleeite grains were found, with one of them poikilitically enclosed by Mnbearing forsterite. Owing to the small size of the brownleeite grains, it was not possible to determine conventional macroscopic properties of this mineral; however, the chemical composition and crystal structure were well constrained by extensive quantitative energy dispersive X-ray analysis and electron diffraction using transmission electron microscopy (TEM). The crystal system for brownleeite is cubic (a = 4.557 Å) with space group P213, cell volume = 94.63 Å3, Z = 4, density (calculated) = 2.913 g/cm3, and empirical formula: (Mn0.77Fe0.18Cr0.05)Si. These brownleeite grains likely formed as high-temperature condensates either in the early Solar System or in the outflow of an evolved star or supernova explosion.

Keywords: MnSi; new minerals; electron microscopy; TEM; electron diffraction; lunar and planetary studies; IDPs

About the article

Received: 2009-04-01

Accepted: 2009-09-29

Published Online: 2015-04-02

Published in Print: 2010-02-01


Citation Information: American Mineralogist, Volume 95, Issue 2-3, Pages 221–228, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2010.3263.

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