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Northwest Africa 11576 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11576 This is an OFFICIAL meteorite name. Abbreviation: NWA 11576 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: 18 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 102 approved meteorites classified as Eucrite-melt breccia. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 22 Jan 2018 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11576 (NWA 11576) (Northwest Africa) Purchased: 2017 Classification: HED achondrite (Eucrite, melt breccia) History: Reportedly found in Mali, September 2017, purchased in Morocco. Physical characteristics: Single stone, no fusion crust, exterior shows numerous light colored clasts set in a dark matrix of shock melt. Petrography: (C. Agee, UNM) Microprobe examination shows basaltic clasts with approximately 60% pyroxene and 35% plagioclase grains most in the range 100-200 μm. Many pyroxene grains have exsolution lamellae. Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs62.1±1.1Wo2.7±0.8, Fe/Mn=32±1, n=7; high-Ca pyroxene Fs28.3±1.6Wo42.2±1.8, Fe/Mn=31±1, n=6; plagioclase An88.9±0.4, n=3. Classification: Eucrite-melt breccia, eucrite clasts are consistent with type 6 (Takeda and Graham, 1991) showing clear compositional separation of low and high calcium pyroxenes. Specimens: 24.5 g on deposit at UNM, Mohamed Aid holds the main mass. | ||||||||||||||||||||||||||||
Bibliography: |
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Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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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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