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Northwest Africa 13428 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13428 This is an OFFICIAL meteorite name. Abbreviation: NWA 13428 Observed fall: No Year found: 2019 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 44 approved meteorites classified as Diogenite-pm. [show all] Search for other: Achondrites, Diogenites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 28 Sep 2020 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 109:
Northwest Africa 13428 (NWA 13428) (Northwest Africa) Purchased: 2019 Classification: HED achondrite (Diogenite, polymict) History: Purchased by Nicholas Gessler in 2019 from a Moroccan dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of angular mineral clasts in a very fine grained matrix. No polymineralic lithic clasts were observed in the studied thin section. The most abundant components are diogenitic orthopyroxene and subordinate olivine, together with <10 vol.% of eucritic low-Ca pyroxene, augite and calcic plagioclase. Accessory phases include silica polymorph, Ti-free chromite, kamacite, ilmenite and troilite. Geochemistry: Diogenitic orthopyroxene (Fs23.9-25.3Wo2.1-3.3, FeO/MnO = 28-29, N = 3), olivine (Fa26.1-28.5, FeO/MnO = 45-49, N = 3), eucritic low-Ca pyroxene (Fs57.9-58.2Wo3.3-6.7, FeO/MnO = 29-33, N = 2), eucritic augite (Fs27.7-30.2Wo40.9-40.1, FeO/MnO = 32-34, N = 2), plagioclase (An83.6-91.6Or0.6-0.3, N = 4). Classification: Diogenite (polymict breccia). Specimens: 21.6 g plus one polished thin section at UWB; remainder with Mr. N. Gessler. | ||||||||||||||||||||||||||||||
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) Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016) |
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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 7547 approved meteorites from (Northwest Africa) (plus 1970 unapproved names) |