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Northwest Africa 13325 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13325 This is an OFFICIAL meteorite name. Abbreviation: NWA 13325 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: 7.84 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 237 approved meteorites classified as Eucrite-br. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 3 Jul 2020 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13325 (NWA 13325) (Northwest Africa) Purchased: 2019 Nov Classification: HED achondrite (Eucrite, brecciated) History: Purchased by Mark Lyon in November 2019 from a Moroccan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of texturally diverse eucrite clasts (up to 2.8 cm across) exhibiting gabbroic, diabasic, granulitic and partially recrystallized textures set within a fragmental matrix of related crystalline debris. Major minerals are low-Ca pyroxene, augite and calcic plagioclase, together with accessory silica polymorph, Ti-Al-bearing chromite, ilmenite, troilite and Ni-free iron metal. In coarser grained gabbroic and diabasic clasts low-Ca and high-Ca pyroxenes are in exsolution relationship and represent former pigeonite, but in granulitic and recrystallized clasts both pyroxenes are present as discrete grains. In partially recrystallized clasts pyroxene is finely polygranular but plagioclase is not. Geochemistry: Low-Ca pyroxene (Fs56.8-58.3Wo4.8-7.0, FeO/MnO = 29-31, N = 5), augite (Fs28.9-30.2Wo40.1-41.0, FeO/MnO = 31-34, N = 5), plagioclase (An88.4-90.0Or0.8-0.5, N = 5). Classification: Eucrite (genomict breccia). Specimens: 212 g including one large polished thin section at UWB; remainder with Mr. M. Lyon. | ||||||||||||||||||||||||||||
Data from: MB109 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) WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011) 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. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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