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Northwest Africa 4138 | |||||||||||||||||||
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Basic information | Name: Northwest Africa 4138 This is an OFFICIAL meteorite name. Abbreviation: NWA 4138 Observed fall: No Year found: 2004 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||
Classification history: |
This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||
Comments: | Approved 28 Mar 2007 | ||||||||||||||||||
Writeup![]() |
Writeup from MB 91:
Northwest Africa 4138 Northwest Africa Find: 2004 Achondrite (polymict eucrite) History: The meteorite was found by an anonymous person in Northwest Africa and bought by C. Anger in Erfoud, Morocco. Physical characteristics: A single stone of 55.5 g was recovered. Petrography: (A. Greshake and M. Kurz MNB) The meteorite is a polymict breccia consisting of impact melt, basaltic, and mineral clasts set in a fine-grained recrystallized groundmass. Mineral fragments are mostly large plagioclase and Ca pyroxene with very fine exsolution lamellae. Minor phases include silica, ilmenite, Al-rich chromite, and troilite. Mineral compositions and geochemistry: Plagioclase (An86.6–94.3), pyroxene (Fs28.2–53.7Wo4.6–41.1). Classification: Achondrite (polymict eucrite); moderate shock, moderate weathering. Type specimen: A total of 11.8 g plus one polished thin section are on deposit at MNB. Anger holds the main mass. | ||||||||||||||||||
Data from: MB91 Table 2 Line 196: |
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Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) Anger: Christian Anger, Korngasse 6, 2405 Bad Deutsch-Altenburg, Austria; Website (private address) Kurz: M. Kurz, Schillerstrasse 7, D-34626 Neukirchen, Germany (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |