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Northwest Africa 7931 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7931 This is an OFFICIAL meteorite name. Abbreviation: NWA 7931 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: 5.9 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 340 approved meteorites classified as Lunar (feldsp. breccia). [show all] Search for other: Lunar meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 30 Nov 2013 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7931 (NWA 7931) (Northwest Africa) Purchased: 2013 May Classification: Lunar meteorite (feldspathic breccia) History: Purchased by Alexandre Debienne in May 2013 from a dealer in Agadir, Morocco. Physical characteristics: A single small stone (5.92 g) lacking fusion crust. Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of numerous small mineral clasts in partly glassy, vesicular matrix. Minerals are anorthite, olivine, fayalite, pigeonite, ilmenite (with rare baddeleyite inclusions), Ti-rich chromite, troilite and minor kamacite. Geochemistry: Olivine (Fa44.3-50.2; FeO/MnO = 85-96), orthopyroxene (Fs28.6Wo1.8; FeO/MnO = 60), pigeonite (Fs29.8-41.1Wo11.3-6.6; FeO/MnO = 52-62), ferroan subcalcic augite (Fs54.4Wo36.4; FeO/MnO = 63). Bulk composition (R. Korotev, WUSL): INAA of subsamples gave mean abundances of FeO 7.5 wt.%, and (in ppm) Sc 18, La 3.9, Sm 1.9, Eu 0.74, Yb 1.6, Th 0.6. Classification: Lunar (feldspathic regolithic breccia). Specimens: 1.2 g of material is at PSF. The remaining material is with ADebienne | ||||||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Institutions and collections |
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) ADebienne: Rue de la Station 60, 6210 Reves, Belgium (private address; updated 29 Nov 2013) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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