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Northwest Africa 11896 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 11896 This is an OFFICIAL meteorite name. Abbreviation: NWA 11896 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: 14 g | ||||||||||||||||||||
Classification history: |
This is 1 of 18 approved meteorites classified as Martian (polymict breccia). [show all] Search for other: Martian meteorites | ||||||||||||||||||||
Comments: |
Approved 31 Aug 2018 Revised 16 Nov 2018: Updated class; see NWA 7034) | ||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11896 (NWA 11896) (Northwest Africa) Purchased: 2017 Classification: Martian meteorite History: The Smithsonian specimen was purchased from Mendy Ouzillou, who had purchased it from Stefan Ralew in Ensisheim in 2017. Physical characteristics: The type specimen has black exterior except for its saw-cut face. The saw cut exposes a gray interior that includes black spherules with sharp boundaries along the contact with the matrix and white, gray, and black clasts. Petrography: Petrographic and microprobe examination of the polished sections show this breccia contains clasts, spherical inclusions, and mineral fragments with a wide range of textures and compositions. The fragmental minerals include orthopyroxene, pigeonite, augite, plagioclase, albitic feldspar, potassium feldspar, phosphates, and opaque oxides. The clasts include basaltic (pyroxene-plagioclase) lithic clasts, with varying mineral compositions. This meteorite is texturally similar to Northwest Africa 7034 and 7475. Geochemistry: Mineral compositions were determined by EPMA at SI. Low-Ca pyroxene are Fs34±8Wo5±4, Fe/Mn = 35±2, n = 144. Augite are Fs24±7Wo40±4, Fe/Mn = 32±3, n = 53. Collectively, the pyroxenes in Fe-Mn composition space have linear regression slope equal to 0.0289, using the method of Papike et al. (2003) American Mineralogist 88: 469. Plagioclase Ab55±10An43±10Or2.4±0.7, n = 71, albitic feldspar Ab81±11An13±11Or5.4±3.2, n = 19, and potassium feldspar Ab20±13An2.0±1.5Or78±14, n = 18 are all present. Classification: Martian, basaltic breccia | ||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012) Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address) |
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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) | ||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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