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Northwest Africa 12227 | |||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12227 This is an OFFICIAL meteorite name. Abbreviation: NWA 12227 Observed fall: No Year found: 2018 Country: Algeria Mass: 1780 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 12227 (NWA 12227) Algeria Find: April 2018 Classification: HED achondrite (Howardite) Petrography: (D. Sheikh, FSU) Fine-grained polymict breccia, <7 mm clast size for basaltic eucrite clasts, <3 mm for diogenite clasts, < 2mm for cumulate eucrite clasts. Modal content (in vol.%): diogenites, 46%; cumulate eucrites, 12%; basaltic eucrites, 35%; anorthosite clasts, 5%; shock melt zones, 1%; opaques, 1%. Geochemistry: Eucrite pyroxene: pigeonite (Fs44.95Wo18.29), n=25; augite (Fs39.9Wo34.4), n=6; FeO/MnO=28. Diogenite pyroxene: orthopyroxene (Fs27.4Wo6.84), n=10; FeO/MnO=22. Calcic plagioclase (An89), N=25. Ilmenite (Fe/(Fe+Mg)) = 88.42%, N=2. FeS and SiO2-rich glass present. Classification: Achondrite (howardite) Specimens: 25.65 grams at UCLA, main mass with Matthew Stream. | ||||||||||||||||||||||
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) FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos: |
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Geography: |
Statistics: This is 1 of 1336 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||
Crosslinks: |
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Revision history: |
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