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| Northwest Africa 11551 | |||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 11551 This is an OFFICIAL meteorite name. Abbreviation: NWA 11551 Observed fall: No Year found: 2017 Country: Mauritania Mass:  447 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 439 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||
| Comments: | Approved 5 Jan 2018 | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Northwest Africa 11551 (NWA 11551) Mauritania Purchased: 2017 Jan 30 Classification: HED achondrite (Howardite) History: Type specimen donated to Cascadia by Mohammed Hmani at the Tucson Gem Show in 2017. Mr. Hmani stated that the meteorite was found in 2014 in Mauritania. Physical characteristics: Exterior surfaces partly covered by black fusion crust; non-crusted surfaces show obvious breccia texture with variegated clasts up 1o 1 cm across. Most surfaces appear relatively unweathered but rust spots are present Petrography: In thin section appears to be a roughly 50-50 mixture of diogenitic (coarse orthopyroxene) and eucritic (plagioclase, pyroxene-dominated) clasts. Some eucritic pyroxene shows zoning. Geochemistry: Diogenitic orthopyroxene Fs27.1±3.8Wo2.4±1.0 (N=182), eucritic low-Ca pyroxene Fs41.6±6.0Wo3.1±1.0 (N=40), augite Fs26.8±7.8Wo41.5±2.5 (N=30), uninverted pigeonite Fs48.8±5.8Wo8.0±2.3 (N=36), bulk inverted pigeonite Fs50.5±5.4Wo10.7±3.0 (N=24). Classification: Howardite based on textures and mineral proportions. Specimens: Cascadia holds 20.0 g and two polished thin sections and a potted butt. The main mass is held by HMANI Inc. (13 Rue Joules Hardouin Mansart, 92600 Asnieres, France). | ||||||||||||||||||||||||||
| Data from: MB107 Table 0 Line 0: |
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| Institutions and collections |
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011) Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address) |
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| References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography:
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Statistics: This is 1 of 195 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters) | ||||||||||||||||||||||||||