[meteorite-list] New Australian fall
Michael Fowler
mqfowler at mac.com
Fri Sep 18 21:37:42 EDT 2009
> And in case you didn't check the met-bull, the Bunburra Rockhole
> meteorite has been classified as a typical Eucrite.
> He stated that said meteorite is not from Vesta, but Eucrites are
> widely accepted to have come from Vesta.
> I suppose we don't have solid proof of that yet, but it is generally
> accepted to be true, based on reflected light analyses.
> Go figure.
> Jason
Hi Jason,
Sorry if I ruffled your feathers earlier.
I did check the met bulletin, and it is described as: " meteorite is
a basaltic eucrite monomict breccia "
http://tin.er.usgs.gov/meteor/index.php?code=48653
However I note that many meteorites are not correctly classified on
their first appearance in the Met Bul, including of course Ibitria,
which is still listed as a Eucrite Monomict, even though we know it is
not from Vesta,
http://tin.er.usgs.gov/meteor/index.php?sea=ibitira&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=no&code=11993
However back to, Bunburra Rockhole, can someone comment or whether
the mineral composition as stated in the met bul is consistent, or
anomalous for a eucrite?
Mineral compositions: Pyroxene, Fs62.5Wo3.6 (Fe/Mn-31.1) with augite
(Fs27.7Wo43.0) lamellae; plagioclase, An84.1 to An88.2.
Of course, the final word is probably the O isotope work, which Dr
Bland says has already been done, although I couldn't find any
additional reference.
Thanks,
Mike
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