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Multi-Length Scale Characterization of the Gibeon Meteorite using Electron Backscatter Diffraction

  • Matthew M. Nowell (a1) and John O. Carpenter (a1)

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The Gibeon meteorite is a differentiated iron meteorite that fell in Nambia, Africa in prehistoric times, with fragments spread over an area 70 miles wide and 230 miles long. The Gibeon fall was initially discovered in 1836, and hundreds of thousands of kilograms of fragments have been recovered. These fragments represent the iron core of a meteorite that cooled and crystallized over thousands of years (Norton 2002).

The microstructure of the Gibeon meteorite, which is primarily an iron-nickel alloy, consists of two phases: kamacite, a body-centered cubic material and taenite, a face-centered cubic material that metallurgists would refer to as ferrite and austenite respectively. This material initially crystallizes as taenite, and as the temperature decreases, transforms into kamacite. This meteorite is classified as a Fine Octahedrite (Of) with an average Nickel content of approximately 7.9%

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References

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Goldstein, J.I. and Michael, J.R. (2006), Meteoritics and Planetary Science 41 (4) 553570.
He, Y., Godet, S., and Jonas, J. (2006) Journal of Applied Crystallography 39 7281.
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Norton, O.R. (2002), The Cambridge Encyclopedia of Meteorites. Cambridge University Press, Cambridge, U.K.
Nowell, M.M., Witt, R.A., and True, B.W. (2005) Microscopy Today 13 (4) 4448

Multi-Length Scale Characterization of the Gibeon Meteorite using Electron Backscatter Diffraction

  • Matthew M. Nowell (a1) and John O. Carpenter (a1)

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