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Northwest Africa 7363
Basic information Name: Northwest Africa 7363
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7363
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 4.05 kg
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 391 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Apr 2020
Writeup from MB 109:

Northwest Africa 7363 (NWA 7363)


Purchased: 2019

Classification: HED achondrite (Eucrite, polymict)

Physical characteristics: The material is friable. Largest intact individuals are 315, 140, 71 and 36 g, some showing black fusion crust, and/or scattered orange-tan weathering and caliche staining. Numerous clasts up to 2 cm consist of conspicuously coarse, black-and-white shaded grains, in contrast with the stone’s finer grained, gray matrix.

Petrography: The rock is a polymict breccia with a finely granulated groundmass. Lithic clast textures range from aphanitic (but sprinkled with relict coarse grains) to gabbroic. A 1.5-cm clast, conspicuously leucocratic compared to the groundmass, is a eucrite uncommonly rich in fayalite. The fayalite is largely in the form of veins within coarse first-generation pyroxenes; the veins are nearly monomineralic but include traces of plagioclase and Cr-spinel, and are consistently surrounded by reaction zones of low-Mg/Fe pyroxene (cf. NWA 5073).

Geochemistry: Low-Ca pyroxene (34 analyses) ranges from Fs30.7Wo5.4 to Fs59.8Wo6.6. High-Ca pyroxene (4 analyses) clusters near Fs27Wo42. Pyroxene FeO/MnO (wt; 40 analyses) averages 31.2. Olivine (6 analyses, all from the aforementioned veins in the large eucrite clast) is Fa62.7-66.3, average Fa65.0+/-1.1. Plagioclase in the veins is anomalously Na-poor, An96.8-98.7 (11 analyses). Elsewhere, plagioclase (31 analyses) is An75.6-98.8, average An92.5±3.7.

Classification: Although the texture indicates a polymict breccia, no diogenite component was found (so it is not a howardite). The meteorite is a polymict eucrite.

Specimens: 35 g at UCLA; main mass (5 kg) with Gessler.

Data from:
  Table 0
  Line 0:
Place of purchase:Mailed from Morocco
Date:P 2019
Mass (g):4050
Pieces:Several hundred
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):65.0±1.1
Classifier:P Warren, UCLA
Type spec mass (g):35
Type spec location:UCLA
Main mass:Nick Gessler
Comments:Gessler's address: 2010 Calgary Lane, Los Angeles, CA 90077; submitted by Paul Warren
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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