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Northwest Africa 11958 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11958 This is an OFFICIAL meteorite name. Abbreviation: NWA 11958 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 2.11 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 276 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 15 Sep 2018 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11958 (NWA 11958) (Northwest Africa) Purchased: 2018 Feb Classification: HED achondrite (Eucrite, monomict) History: Purchased by Bob Falls in February 2018 from a Moroccan dealer at the Tucson Gem and Mineral Show. Physical characteristics: A single stone (2112 g) composed of greenish beige crystalline clasts (up to 5 cm across) in a patchy, very dark and fine grained matrix. Petrography: (A. Irving and S. Kuehner, UWS) Breccia consisting of ophitic-textured eucrite clasts in a sparse, dark matrix composed of related crystalline debris within very fine grained quenched melt. Clasts are composed of exsolved pigeonite and calcic plagioclase (both microcrystalline) with accessory silica polymorph, ilmenite, Ti-chromite, troilite, Ni-free metal and minor secondary barite. Cross-cutting veinlets composed of vesicular glass, quenched crystals and entrained eucrite debris are also present. Geochemistry: Orthopyroxene host (Fs58.3-61.4Wo6.5-3.0, FeO/MnO = 30-31, N = 3), clinopyroxene exsolution lamellae (Fs26.4-29.1Wo44.1-41.6, FeO/MnO = 32-36, N = 2), plagioclase (An86.2-89.8Or0.8-0.2, N = 2). Classification: Eucrite (monomict breccia, shock melted). Specimens: 25.5 g in the form of a large 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 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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