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Northwest Africa 4642 | |||||||||||||||||||||||
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Basic information | Name: Northwest Africa 4642 This is an OFFICIAL meteorite name. Abbreviation: NWA 4642 Observed fall: No Year found: 2007 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||
Classification history: |
This is 1 of 12 approved meteorites classified as Enst achon. [show all] Search for other: Achondrites, Enstatite achondrites, and Enstatite-rich meteorites | ||||||||||||||||||||||
Comments: | Approved 16 Dec 2008 | ||||||||||||||||||||||
Writeup![]() |
Writeup from MB 94:
Northwest Africa 4642 Northwest Africa Find: 2006 Enstatite achondrite History: The meteorite was found by an anonymous finder in northwest Africa and bought by the main mass holder in Erfoud, Morocco. Physical characteristics: One fragment of 483.2 g partly covered with fusion crust was found. Petrography: (A. Greshake, MNB) The meteorite predominantly consists of subhedral enstatite grains. Minor phases include feldspar, Fe-Cr-sulfides, and rare Fe,Ni-metal; no chondrules were found. Geochemistry: Pyroxene, Fs0–1.2. Oxygen Isotopes (I. A. Franchi and R. C. Greenwood, OU): δ17O = 2.975‰, δ18O = 5.614‰, Δ17O = 0.056‰. Classification: Enstatite achondrite; low degree of shock, moderate degree of weathering. Type specimens: A total of 22.6 g and one polished thin section are on deposit at MNB. HSSH holds the main mass. | ||||||||||||||||||||||
Data from: MB94 Table 2 Line 49: |
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Plots: | O isotopes: | ||||||||||||||||||||||
Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011) HSSH: Hanno Strufe, Langenbergstr. 32, 66954 Pirmasens, Germany; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |