[meteorite-list] New lunar meteorite

From: Adam Hupe <raremeteorites_at_meteoritecentral.com>
Date: Wed Jul 6 00:41:15 2005
Message-ID: <00c801c581e5$1855d7a0$6401a8c0_at_c1720188a>

NWA 773 is not a Norite.

NWA 773
The cumulate is coarse grained and the thin sections are small, so the modal
mineral proportions obtained from different sections do not agree well.
Because augite and pigeonite, both clinopyroxenes, dominate over
orthopyroxene, which is at most "minor" (Korotev et al., 2002), the cumulate
is a gabbro, not a norite. Specifically, it is an olivine gabbro because
olivine exceeds 10%. If plagioclase is actually <10%, then it's a peridotite

Here is a link that will clarify the misclassification:
http://epsc.wustl.edu/admin/resources/meteorites/nwa773.html

Kind Regards,

Adam
Received on Wed 06 Jul 2005 12:42:18 AM PDT