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Northwest Africa 12231 | |||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12231 This is an OFFICIAL meteorite name. Abbreviation: NWA 12231 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 13 g | ||||||||||||||||||||||
Classification history: |
This is 1 of 459 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||
Comments: | Approved 11 Dec 2018 | ||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12231 (NWA 12231) (Northwest Africa) Purchased: 2018 Classification: HED achondrite (Howardite) History: Purchased by V. Ouellet in Zagora in 2018. Physical characteristics: The sample is a small stone with black fusion crust and a light grey, fine-grained interior. Petrography: The sample is a fine-grained polymict breccia. Modal percentages of lithic fragments (in vol.%): cumulate eucrite clasts, 40%; basaltic eucrites, 30%; diogenitic clasts, 20%; anorthosite clasts, 5%; opaques, 3%; glass, 2%. Geochemistry: Eucritic pyroxene: pigeonite (Fs47.1±4.3Wo15.8±4.3), n=15; augite (Fs38.9±3.8Wo31.2±3.6), n=6. Diogenitic pyroxene: orthopyroxene (Fs18.05 ±1.6Wo4.54±1.6), n=9. Calcic plagioclase (An88.4±4.2), N=15. Ilmenite (Fe/(Fe+Mg)) = 90.06%, N=4. Chromite, FeS and FeO Present. Silica-rich glass present. Classification: howardite Specimens: 3 g part slice at UCLA. 1 g powdered sample with C. Anderkin. Remainder of mass with V. Oullet. | ||||||||||||||||||||||
Data from: MB107 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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