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Northwest Africa 4138
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:help 55.5 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Eucrite-pmict
Recommended:  Eucrite    [explanation]

This is 1 of 513 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 28 Mar 2007
Writeuphelp
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:
Place of purchase:Erfoud, Morocco
Date:2004
Mass (g):55.5
Pieces:1
Class:Euc
Classifier:A. Greshake and M. Kurz, MNB
Type spec mass (g):11.8
Type spec location:MNB
Main mass:Anger
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Gerald Armstrong   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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