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Northwest Africa 2251
Basic information Name: Northwest Africa 2251
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2251
Observed fall: No
Year found: 2001
Country: Algeria
Mass:help 17 g
Classification
  history:
Meteoritical Bulletin:  MB 89  (2005)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Writeuphelp
Writeup from MB 89:

Northwest Africa 2251

Found 2001 October

Achondrite (howardite)

A fusion-crusted stone of 17 g was found by nomads on October 2001 near Tindouf (western Algeria). Mineralogy and classification (A. Seddiki, Université d'Oran, Es-Sénia, Algeria, and Universitè Jean Monnet, Saint-Etienne, France; B. Moine, J.Y. Cottin, Universitè Jean Monnet, Saint-Etienne, France; V. Sautter, J.P. Lorand, M. Denise, MNHNP): Cumulate eucritic and diogenitic clasts in a clastic matrix. Eucrite clasts contain plagioclase An90 (range An88-92), pigeonite (Fs43-53 Wo6-20) with exsolved augite (Fs37 Wo25). Minor minerals are a silica phase, troilite, Ti-chromite (TiO2 = 1.65 wt. %) and ilmenite. Diogenite clasts are composed by orthopyroxene (Fs32-36 Wo2-4) with augite exsolution lamellae (Fs42 Wo46), chromite, troilite and ilmenite. The Fe/Mn atomic ratio in pyroxenes ranges from 24 to 30. Eucritic clasts comprise <60 vol. % of the rock. The analyses of the glass in the fusion crust corresponds to the bulk compositions of howardites. The oxygen isotopic composition (18δO=5.2, 17δO=2.3, Δ17O = -0.4) confirms that this rock belongs to the HED suite, although the Δ17O is slightly lower than the HED grand mean. Specimens: main mass 16 g, MNHNP, thin section, Universitè Jean Monnet, Saint-Etienne, France.

Data from:
  MB89
  Table 7
  Line 136:
Origin or pseudonym:Tindouf , Algeria
Date:Oct 2001
Latitude:27°58'N
Longitude:7°57'W
Mass (g):17
Pieces:1
Class:How
Ferrosilite (mol%):43-53
Classifier:A. Seddiki, Université d'Oran, Es-Sénia, Algeria, and Universitè Jean Monnet, Saint-Etienne, France; B. Moine, J.Y. Cottin, Universitè Jean Monnet, Saint-Etienne, France. V. Sautter, J.P. Lorand, M. Denise, MNHNP)
Type spec mass (g):16
Main mass:MNHNP
Comments:see separate entry; Note omitted from MB89 by accident:
Plots: O isotopes:  
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:
     Recommended::   (27° 58'N, 7° 57'W)

Statistics:
     This is 1 of 32 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 970 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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