so then has it be reclassified - twice - the original classification from
NAU calls it: 'cumulate olivine norite with regolith breccia'???
From: "Adam Hupe" <[EMAIL PROTECTED]>
To: <[email protected]>
Subject: Re: [meteorite-list] New lunar meteorite
Date: Tue, 5 Jul 2005 21:42:18 -0700
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
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