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Licensed Unlicensed Requires Authentication Published by De Gruyter March 28, 2015

Letter. Crystal morphology of MV-1 magnetite

  • Simon J. Clemett , Kathie L. Thomas-Keprta EMAIL logo , Joel Shimmin , Mary Morphew , J. Richard Mcintosh , Dennis A. Bazylinski , Joseph L. Kirschvink , Susan J. Wentworth , David S. Mckay , Hojatollah Vali , Everett K. Gibson and Christopher S. Romanek
From the journal American Mineralogist
https://doi.org/10.2138/am-2002-11-1223

Abstract

Intracellular magnetite (Fe3O4) crystals produced by magnetotactic bacteria strain MV-1 are in the single-domain size range, and are chemically pure. We have previously suggested that they exhibit an unusual crystal habit described as truncated hexa-octahedral. Such a crystal morphology has not been demonstrated for any inorganic population of magnetite, nor would it be expected, given considerations of symmetry and free energy. By inference, this morphology is a physical signature of a biological origin. Here we report data from transmission electron microscope (TEM) tomography of such crystals isolated from magnetotactic bacteria, which confirm the unusual geometry, originally proposed from classical TEM tilt imaging.

Received: 2002-3-5
Accepted: 2002-8-31
Published Online: 2015-3-28
Published in Print: 2002-11-1

© 2015 by Walter de Gruyter Berlin/Boston

From the journal
American Mineralogist
American Mineralogist
Volume 87 Issue 11-12

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Letter. Crystal morphology of MV-1 magnetite
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