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Northwest Africa 4642
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:help 483 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  Enstatite achondrite
Recommended:  Enst achon    [explanation]

This is 1 of 9 approved meteorites classified as Enst achon.   [show all]
Search for other: Achondrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 16 Dec 2008
Writeuphelp
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:
State/Prov/County:Morocco
Date:2006
Mass (g):483.2
Pieces:1
Class:Enstatite achondrite
Ferrosilite (mol%):0-1.2
Classifier:A. Greshake, MNB
Type spec mass (g):22.6
Type spec location:MNB
Main mass:HSSH
Comments:δ17O = 2.975‰, δ18O = 5.614‰, Δ17O = 0.056‰.
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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