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Northwest Africa 13223 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13223 This is an OFFICIAL meteorite name. Abbreviation: NWA 13223 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 272 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 5 Apr 2020 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 109:
Northwest Africa 13223 (NWA 13223) (Northwest Africa) Purchased: 2019 Nov Classification: HED achondrite (Eucrite, monomict) History: Purchased by Aziz Habibi in November 2019 from a Malian dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of large diabasic eucrite clasts (mean grainsize 0.5 mm) with sparse regions of polygranular matrix and cross-cutting granulated zones. Major minerals are zoned pyroxenes (consisting of low-Ca pyroxene cores and rims of pigeonite with patchy, dark pyroxferroite) and lath-like calcic plagioclase (converted completely to maskelynite), together with accessory silica polymorph, ilmenite, troilite, Ni-free metal, and baddeleyite. Minor thin veinlets of secondary calcite and small grains of barite are present. Geochemistry: Low-Ca pyroxene cores (Fs35.7-47.1Wo7.5-11.8, FeO/MnO = 27-28, N = 4), pigeonite rims (Fs44.0-66.6Wo18.6-21.7, FeO/MnO = 28-36, N = 4), subcalcic augite (Fs46.6-56.7Wo29.6-25.6, FeO/MnO = 32-36, N = 2), pyroxferroite (Fs77.6Wo15.7, FeO/MnO = 19), fayalite (Fa92.6-96.2, FeO/MnO = 43-46, N = 2), maskelynite (An87.6-89.0Or0.4-0.5, N = 3). Classification: Eucrite (monomict breccia, diabasic, highly shocked, maskelynite-bearing). Specimens: 20.0 g including one polished thin section at UWB; remainder with Mr. A. Habibi. | ||||||||||||||||||||||||||||||
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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012) |
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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 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |