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Northwest Africa 11774 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11774 This is an OFFICIAL meteorite name. Abbreviation: NWA 11774 Observed fall: No Year found: 2018 Country: Mauritania Mass: 439 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 270 approved meteorites classified as Mesosiderite. [show all] Search for other: Mesosiderites, Metal-rich meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 12 May 2018 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11774 (NWA 11774) Mauritania Purchased: 2018 Jan Classification: Mesosiderite History: Found near Ain Ben Tili, Mauritania, in December 2017 and purchased by Bob Falls in January 2018 from a Moroccan dealer. Physical characteristics: A single metal-rich mass (439.2 g) with a weathered exterior. The fresh interior consists mainly of metal with ~10 vol.% interstitial silicate-rich material. Petrography: (A. Irving and S. Kuehner, UWS) Composed predominantly of granular kamacite (containing small, irregularly-shaped grains of taenite and rare schreibersite) together with interstitial regions containing calcic plagioclase, orthopyroxene, silica polymorph, chromite, merrillite, ilmenite and troilite. Geochemistry: Orthopyroxene (Fs30.3-31.7Wo2.9-3.8, FeO/MnO = 18-19, N = 3), plagioclase (An85.3-86.9Or0.5-0.2, N = 2). Classification: Mesosiderite. This specimen has close textural and mineralogical similarities to the metal-rich nodules in Bondoc, and is unusual because of its very high metal/silicate ratio relative to typical examples. Specimens: 24.1 g in the form of a polished slice at UWB; remainder with Mr. R. Falls. | ||||||||||||||||||||||||||||
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) |
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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 217 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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