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Northwest Africa 12265 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12265 This is an OFFICIAL meteorite name. Abbreviation: NWA 12265 Observed fall: No Year found: 2015 Country: (Northwest Africa) Mass: 4.43 kg | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 100 approved meteorites classified as Eucrite-melt breccia. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 11 Dec 2018 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12265 (NWA 12265) (Northwest Africa) Purchased: 2015 Jan Classification: HED achondrite (Eucrite, melt breccia) History: Purchased in Rissani, Morocco by Adam Aaronson in January 2015. Petrography: (A. Irving and S. Kuehner, UWS) Composed predominantly of a vesicular quenched melt rock lithology enclosing sparse remnant clasts of shocked gabbroic eucrite. The fine grained melt rock lithology consists of aluminous pigeonite (with two distinct Fe/Mg ratios) and calcic plagioclase with accessory Ti-poor chromite, Cr-ulvöspinel and troilite. Gabbroic eucrite clasts contain recrystallized pigeonite and polycrystalline calcic plagioclase with minor fayalite, silica polymorph, Ti-poor chromite, Ti-chromite, trolite and minor barite. Geochemistry: Pigeonite (Fs31.2-38.4Wo12.0-17.1, FeO/MnO = 26-28, Al2O3 = 2.3-5.7 wt.%, N = 3), ferroan pigeonite (Fs56.6-58.7Wo16.8-19.6, FeO/MnO = 32-33, Al2O3 = 0.8-1.1 wt.%), fayalite (Fa80.4-80.8, FeO/MnO = 45-47, N = 2), plagioclase (An88.0-89.9Or0.4-0.8, N = 2). Classification: Eucrite (vesicular, shock-melted breccia). Specimens: 20.6 g including one polished thin section at UWB; remainder with Aaronson. | ||||||||||||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 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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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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