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Northwest Africa 7363 | |||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7363 This is an OFFICIAL meteorite name. Abbreviation: NWA 7363 Observed fall: No Year found: 2019 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||||
Classification history: |
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![]() |
Writeup from MB 109:
Northwest Africa 7363 (NWA 7363) Morocco 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: MB109 Table 0 Line 0: |
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Institutions 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:![]() |
Statistics: This is 1 of 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater) |