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Northwest Africa 4836 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 4836 This is an OFFICIAL meteorite name. Abbreviation: NWA 4836 Observed fall: No Year found: 2006 Country: (Northwest Africa) Mass: 166 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 406 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 26 Feb 2024 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 113:
Northwest Africa 4836 (NWA 4836) (Northwest Africa) Purchased: 2006 Classification: HED achondrite (Eucrite, polymict) History: Purchased by Marcin Cimala in 2006 from a dealer in Erfoud, Morocco. Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Breccia composed predominantly of angular mineral grains and some lithic clasts derived from eucritic lithologies plus <10 vol.% of diogenitic orthopyroxene grains set within a fine grained matrix. Minerals are exsolved pigeonite, augite, unexsolved pigeonite, calcic plagioclase, anorthite, silica polymorph, chromite, ilmenite, troilite, Fe-metal and merrillite. Lithic eucrite clasts have intergranular textures and exhibit a range in grainsize. Geochemistry: Diogenitic orthopyroxene (Fs24.9-25.8Wo1.7-2.0, FeO/MnO = 30-32, N = 3), low-Ca pyroxene hosts (Fs42.4-48.1Wo2.4-5.4, FeO/MnO = 28-32, N = 9), pigeonite hosts (Fs58.7-60.5Wo5.7-6.6, FeO/MnO = 31-34, N = 5), pigeonite (Fs32.1-43.1Wo5.6-9.2, FeO/MnO = 28-33, N = 9; Fs49.4-53.4Wo16.6-13.1, FeO/MnO = 31-33, N = 3), augite (Fs21.0-21.9Wo43.2-42.0, FeO/MnO = 28-30, N = 2; Fs32.3Wo39.9, FeO/MnO = 33), calcic plagioclase (An75.5-90.2Or1.4-0.2, N = 3), anorthite (An94.3Or0.2). Classification: Eucrite (polymict breccia). Specimens: 20.0 g including one polished thin section at BrownU; remainder with Mr. M. Cimala. | ||||||||||||||||||||||||||||
Data from: MB113 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) BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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