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

Published online by Cambridge University Press:  14 March 2018

Matthew M. Nowell  and
John O. Carpenter
Matthew M. Nowell
Affiliation:
EDAX-TSL, Draper UT
John O. Carpenter
Affiliation:
EDAX-TSL, Draper UT

Extract

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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%

Type
Research Article
Information
Microscopy Today , Volume 15 , Issue 5 , September 2007 , pp. 6 - 11
Copyright
Copyright © Microscopy Society of America 2007

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