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Northwest Africa 4023 | |||||||||||||||||
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Basic information | Name: Northwest Africa 4023 This is an OFFICIAL meteorite name. Abbreviation: NWA 4023 Observed fall: No Year found: 2005 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||
Classification history: |
This is 1 of 391 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||
Comments: |
Approved 3 Feb 2006 Revised 9 Sep 2006: Update classification | ||||||||||||||||
Writeup![]() |
Writeup from MB 90:
Northwest Africa 4023 Northwest Africa Find: 2005 Achondrite (eucrite, polymict) History: A single stone of 17.2 g partly covered with fusion crust was found in the western part of the Sahara in Morocco in 2005. Petrography: (A. Greshake, MNB) A polymict breccia consisting of basaltic, melt clasts, and mineral clasts set into a fine-grained brecciated groundmass. Mineral fragments are dominantly plagioclase and exsolved Ca pyroxene. Minor phases include silica, Al-Ti-chromite, and ilmenite. Geochemistry: Plagioclase (An78.6–94.2), pyroxene (Fs27.7–56.5Wo2.7–40.2). Classification: Achondrite (eucrite, polymict) with a high degree of shock and moderate degree of weathering. Specimens: A 3.45 g type specimen and one polished thin section are on deposit at MNB. HSSH-Pirmasens of Germany holds the main mass. | ||||||||||||||||
Data from: MB90 Table 2 Line 245: |
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Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
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Geography: |
Statistics: This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |