Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.7506w&link_type=abstract
American Astronomical Society, AAS Meeting #208, #75.06
Other
Scientific paper
Measurement of bulk magnetic susceptibility per unit mass is a new, quick, non-destructive method to classify meteorites. Macke et al. (2005) and Rochette et al. (2003) used it to classify ordinary chondrites. We have used a KLY Kappabridge on twelve more diverse meteorites and found it to be an accurate classifier except for one meteorite sample.
The iron meteorites had the strongest bulk magnetic susceptibility per unit mass, as expected. The ordinary chondrites separated clearly into their H, L, and LL (high, low, low low iron) categories. The carbonaceous chondrites were lower still, then the achondrite was the lowest. However, one carbonaceous chondrite, NWA 801, fell between H and L ordinary chondrites. It is classified as CR (Renazzo type), and this type of meteorite is known to contain some nickel-iron, magnetite and iron sulfides. Why these metals occur in this type of meteorite is not yet understood.
We conclude that magnetic susceptibility measurements are an excellent way to classify meteorites without having to destroy them. However, this would have to be combined with other methods to properly classify meteorites of the CR type.
We thank Bob Summerfield and Al Witzgall for assistance in obtaining samples, and Stephanie Brachfeld for use of her equipment.
Stolarz M.
West Mary Lou
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