Northwest Africa 13509 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13509 This is an OFFICIAL meteorite name. Abbreviation: NWA 13509 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 1239 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 78 approved meteorites classified as LL4-6. | ||||||||||||||||||||||||||||||
Comments: | Approved 2 Nov 2020 | ||||||||||||||||||||||||||||||
Writeup | Writeup from MB 109: Northwest Africa 13509 (NWA 13509) (Northwest Africa) Purchased: 2018 Sep Classification: Ordinary chondrite (LL4-6) History: Purchased by John Higgins in September 2018 from a Mauritanian dealer. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh recrystallized breccia composed of Type 6 lithic clasts (containing rare remnant chondrules) plus large (up to 5 mm in diameter), well-formed, equilibrated discrete chondrules (Type 4) in a fine grained, highly recrystallized matrix containing troilite, pentlandite, taenite and chromite. Geochemistry: Olivine (31.2±0.2, range Fa30.9-31.5, N = 5), low-Ca pyroxene (Fs25.4±0.1Wo1.8±0.3, range Fs25.3-25.6Wo1.3-2.0, N = 5), augite (Fs10.5±0.3Wo43.7±0.3, range Fs10.2-10.7Wo43.5-44.1, N = 3). Classification: Ordinary chondrite (LL4-6 breccia, highly recrystallized). Specimens: 45 g including one polished thin section at UWB; remainder with Mr. J. Higgins. | ||||||||||||||||||||||||||||||
Data from: MB109 Table 0 Line 0: |
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Institutions and collections | University of Washington Seattle Washington Univ St. Louis | ||||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020) | ||||||||||||||||||||||||||||||
Geography: |
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