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Mineralogical and Isotopic Properties of Biogenic Nanocrystalline Magnetites

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Book cover Magnetoreception and Magnetosomes in Bacteria

Part of the book series: Microbiology Monographs ((MICROMONO,volume 3))

Abstract

Determination of the origin of magnetite nanocrystals is of primary importance because of their significance as biomarkers for extraterrestrial life and as environmental indicators. A critical analysis of the literature indicates that morphology and magnetic properties of the crystals do not necessarily quantitatively allow differentiation of biogenic from abiotic nanomagnetite crystals. Mineralogical properties of magnetosomes and of inorganic crystals such as size and shape factors and their distributions, morphology and defects and twinning are presented and compared in this chapter. Isotopic properties and the fractionation of oxygen and iron isotopes of the nanosized particles are reviewed. These properties are then examined as potential tools if the process and conditions formation responsible for their genesis are known. Exploration of properties such as crystal size distributions and oxygen isotope fractionation at given temperature seems to allow the discrimination of biogenic from abiotic nanocrystals of magnetite.

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Acknowledgments

We thank A. Isambert for Figs. 4 and 5, N. Menguy for his help with Figs. 1, 4 and 5 and O. Lopez for his help with Fig. 6. Valuable discussions, chronologically, with R. Hellmann, F. Guyot, N. Menguy, P. Agrinier, A. Isambert, A. Komeili, D. Newman, T. Bullen, D. Schüler, and members of his group, D. Bazylinski, B. Matzanke and R. Dunin-Borkowski helped us in understanding the different aspects presented in this chapter. D.F. acknowledges support from a Marie Curie fellowship from the European Union.

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  1. Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, 28359, Bremen, Germany

    Damien Faivre

  2. Institut de Physique du Globe de Paris, 4 place Jussieu, 75252, Paris Cedex 5, France

    Pierpaolo Zuddas

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Correspondence to Damien Faivre .

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Faivre, D., Zuddas, P. (2006). Mineralogical and Isotopic Properties of Biogenic Nanocrystalline Magnetites. In: Schüler, D. (eds) Magnetoreception and Magnetosomes in Bacteria. Microbiology Monographs, vol 3. Springer, Berlin, Heidelberg . https://doi.org/10.1007/7171_043

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