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Northwest Africa 13227 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13227 This is an OFFICIAL meteorite name. Abbreviation: NWA 13227 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: 2.3 kg | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 319 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 5 Apr 2020 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 13227 (NWA 13227) (Northwest Africa) Purchased: 2019 Nov Classification: Martian meteorite (Shergottite) History: Purchased by Mark Lyon in November 2019 from a Moroccan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Coarse grained (gabbroic) assemblage of zoned clinopyroxene (up to 3.5 mm), olivine (some as inclusions in clinopyroxene) and curvilinear, lath-like maskelynite (~15 vol.%), together with accessory Mg-ilmenite, Cr-ulvöspinel, pyrrhotite, baddeleyite, merrillite and chlorapatite. Minor veinlets of secondary calcite are present. Geochemistry: Olivine (Fa35.5-51.6, FeO/MnO = 50-55, N = 11), pigeonite cores (Fs25.6-28.2Wo5.2-9.3, FeO/MnO = 28-33, N = 6), subcalcic augite rims (Fs21.5-21.6Wo31.3-31.8; Fs28.0Wo26.9; FeO/MnO = 27-30, N = 3), pigeonite rims (Fs34.6-36.6Wo12.3-15.7, FeO/MnO = 30-33, N = 3), maskelynite (An51.7-57.1Or1.8-2.8, N = 4). Classification: Shergottite (olivine gabbroic). Specimens: 21.6 g including one 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 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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